631916605 has 32 divisors (see below), whose sum is σ = 857412864. Its totient is φ = 444466176.

The previous prime is 631916603. The next prime is 631916627. The reversal of 631916605 is 506619136.

It is a cyclic number.

It is not a de Polignac number, because 631916605 - 2¹ = 631916603 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631916603) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80307 + ... + 87823.

It is an arithmetic number, because the mean of its divisors is an integer number (26794152).

Almost surely, 2^631916605 is an apocalyptic number.

It is an amenable number.

631916605 is a deficient number, since it is larger than the sum of its proper divisors (225496259).

631916605 is a wasteful number, since it uses less digits than its factorization.

631916605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7605.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 631916605 is about 25137.9514877406. The cubic root of 631916605 is about 858.1303374751.

It can be divided in two parts, 63191 and 6605, that added together give a palindrome (69796).

The spelling of 631916605 in words is "six hundred thirty-one million, nine hundred sixteen thousand, six hundred five".