1620225533 has 2 divisors, whose sum is σ = 1620225534. Its totient is φ = 1620225532.

The previous prime is 1620225521. The next prime is 1620225601. The reversal of 1620225533 is 3355220261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1590653689 + 29571844 = 39883^2 + 5438^2 .

It is an emirp because it is prime and its reverse (3355220261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1620225533 - 2²² = 1616031229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1620225496 and 1620225505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620224533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810112766 + 810112767.

It is an arithmetic number, because the mean of its divisors is an integer number (810112767).

Almost surely, 2^1620225533 is an apocalyptic number.

It is an amenable number.

1620225533 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620225533 is an equidigital number, since it uses as much as digits as its factorization.

1620225533 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1620225533 is about 40252.0252037087. The cubic root of 1620225533 is about 1174.5147917873.

Adding to 1620225533 its reverse (3355220261), we get a palindrome (4975445794).

The spelling of 1620225533 in words is "one billion, six hundred twenty million, two hundred twenty-five thousand, five hundred thirty-three".