1225204531 has 4 divisors (see below), whose sum is σ = 1289689000. Its totient is φ = 1160720064.

The previous prime is 1225204529. The next prime is 1225204567. The reversal of 1225204531 is 1354025221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1354025221 = 24247 ⋅55843.

It is a cyclic number.

It is not a de Polignac number, because 1225204531 - 2¹ = 1225204529 is a prime.

It is a super-2 number, since 2×1225204531² = 3002252285565859922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1225204496 and 1225204505.

It is not an unprimeable number, because it can be changed into a prime (1225204231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32242206 + ... + 32242243.

It is an arithmetic number, because the mean of its divisors is an integer number (322422250).

Almost surely, 2^1225204531 is an apocalyptic number.

1225204531 is a deficient number, since it is larger than the sum of its proper divisors (64484469).

1225204531 is an equidigital number, since it uses as much as digits as its factorization.

1225204531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64484468.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1225204531 is about 35002.9217494769. The cubic root of 1225204531 is about 1070.0470270768.

Adding to 1225204531 its reverse (1354025221), we get a palindrome (2579229752).

The spelling of 1225204531 in words is "one billion, two hundred twenty-five million, two hundred four thousand, five hundred thirty-one".