616920631 has 4 divisors (see below), whose sum is σ = 617732064. Its totient is φ = 616109200.

The previous prime is 616920593. The next prime is 616920653. The reversal of 616920631 is 136029616.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 616920631 - 2¹¹ = 616918583 is a prime.

It is a super-2 number, since 2×616920631² = 761182129906876322, 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 (616920691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404575 + ... + 406096.

It is an arithmetic number, because the mean of its divisors is an integer number (154433016).

Almost surely, 2^616920631 is an apocalyptic number.

616920631 is a deficient number, since it is larger than the sum of its proper divisors (811433).

616920631 is an equidigital number, since it uses as much as digits as its factorization.

616920631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811432.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 616920631 is about 24837.8870075536. The cubic root of 616920631 is about 851.2878429474.

The spelling of 616920631 in words is "six hundred sixteen million, nine hundred twenty thousand, six hundred thirty-one".