616408631 has 4 divisors (see below), whose sum is σ = 616961592. Its totient is φ = 615855672.

The previous prime is 616408613. The next prime is 616408633. The reversal of 616408631 is 136804616.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-616408631 is a prime.

It is a super-2 number, since 2×616408631² = 759919200742588322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 616408591 and 616408600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616408633) 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 in 3 ways as a sum of consecutive naturals, for example, 274805 + ... + 277038.

It is an arithmetic number, because the mean of its divisors is an integer number (154240398).

Almost surely, 2^616408631 is an apocalyptic number.

616408631 is a deficient number, since it is larger than the sum of its proper divisors (552961).

616408631 is a wasteful number, since it uses less digits than its factorization.

616408631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552960.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 616408631 is about 24827.5780333080. The cubic root of 616408631 is about 851.0522750927.

The spelling of 616408631 in words is "six hundred sixteen million, four hundred eight thousand, six hundred thirty-one".