1225620533 has 4 divisors (see below), whose sum is σ = 1267883340. Its totient is φ = 1183357728.

The previous prime is 1225620521. The next prime is 1225620541. The reversal of 1225620533 is 3350265221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3350265221 = 347 ⋅9654943.

It can be written as a sum of positive squares in 2 ways, for example, as 564205009 + 661415524 = 23753^2 + 25718^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225620533 - 2⁶ = 1225620469 is a prime.

It is a super-2 number, since 2×1225620533² = 3004291381822408178, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 42262777 = 1225620533 / (1 + 2 + 2 + 5 + 6 + 2 + 0 + 5 + 3 + 3).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1225620496 and 1225620505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225620733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21131360 + ... + 21131417.

It is an arithmetic number, because the mean of its divisors is an integer number (316970835).

Almost surely, 2^1225620533 is an apocalyptic number.

It is an amenable number.

1225620533 is a deficient number, since it is larger than the sum of its proper divisors (42262807).

1225620533 is an equidigital number, since it uses as much as digits as its factorization.

1225620533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42262806.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 1225620533 is about 35008.8636347997. The cubic root of 1225620533 is about 1070.1681201463.

Adding to 1225620533 its reverse (3350265221), we get a palindrome (4575885754).

The spelling of 1225620533 in words is "one billion, two hundred twenty-five million, six hundred twenty thousand, five hundred thirty-three".