621456631 has 8 divisors (see below), whose sum is σ = 643222800. Its totient is φ = 599712960.

The previous prime is 621456611. The next prime is 621456637. The reversal of 621456631 is 136654126.

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

It is a cyclic number.

It is not a de Polignac number, because 621456631 - 2¹¹ = 621454583 is a prime.

It is a super-2 number, since 2×621456631² = 772416688427740322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621456637) 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, 66400 + ... + 75178.

It is an arithmetic number, because the mean of its divisors is an integer number (80402850).

Almost surely, 2^621456631 is an apocalyptic number.

621456631 is a deficient number, since it is larger than the sum of its proper divisors (21766169).

621456631 is a wasteful number, since it uses less digits than its factorization.

621456631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11249.

The product of its digits is 25920, while the sum is 34.

The square root of 621456631 is about 24929.0318905488. The cubic root of 621456631 is about 853.3691567026.

The spelling of 621456631 in words is "six hundred twenty-one million, four hundred fifty-six thousand, six hundred thirty-one".