621264251 has 8 divisors (see below), whose sum is σ = 634008384. Its totient is φ = 608558080.

The previous prime is 621264239. The next prime is 621264257. The reversal of 621264251 is 152462126.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621264251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621264257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24830 + ... + 43116.

It is an arithmetic number, because the mean of its divisors is an integer number (79251048).

Almost surely, 2^621264251 is an apocalyptic number.

621264251 is a deficient number, since it is larger than the sum of its proper divisors (12744133).

621264251 is a wasteful number, since it uses less digits than its factorization.

621264251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18981.

The product of its digits is 5760, while the sum is 29.

The square root of 621264251 is about 24925.1730385167. The cubic root of 621264251 is about 853.2810904330.

The spelling of 621264251 in words is "six hundred twenty-one million, two hundred sixty-four thousand, two hundred fifty-one".