621425513 has 4 divisors (see below), whose sum is σ = 621479508. Its totient is φ = 621371520.

The previous prime is 621425503. The next prime is 621425521. The reversal of 621425513 is 315524126.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 248472169 + 372953344 = 15763^2 + 19312^2 .

It is a cyclic number.

It is not a de Polignac number, because 621425513 - 2⁶ = 621425449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621425503) 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, 2048 + ... + 35313.

It is an arithmetic number, because the mean of its divisors is an integer number (155369877).

Almost surely, 2^621425513 is an apocalyptic number.

It is an amenable number.

621425513 is a deficient number, since it is larger than the sum of its proper divisors (53995).

621425513 is a wasteful number, since it uses less digits than its factorization.

621425513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53994.

The product of its digits is 7200, while the sum is 29.

The square root of 621425513 is about 24928.4077509977. The cubic root of 621425513 is about 853.3549129709.

Adding to 621425513 its reverse (315524126), we get a palindrome (936949639).

The spelling of 621425513 in words is "six hundred twenty-one million, four hundred twenty-five thousand, five hundred thirteen".