631620613 has 4 divisors (see below), whose sum is σ = 680206828. Its totient is φ = 583034400.

The previous prime is 631620611. The next prime is 631620623. The reversal of 631620613 is 316026136.

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

It can be written as a sum of positive squares in 2 ways, for example, as 126180289 + 505440324 = 11233^2 + 22482^2 .

It is not a de Polignac number, because 631620613 - 2¹ = 631620611 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 (631620611) 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, 24293088 + ... + 24293113.

It is an arithmetic number, because the mean of its divisors is an integer number (170051707).

Almost surely, 2^631620613 is an apocalyptic number.

It is an amenable number.

631620613 is a deficient number, since it is larger than the sum of its proper divisors (48586215).

631620613 is a wasteful number, since it uses less digits than its factorization.

631620613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48586214.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 631620613 is about 25132.0634449303. The cubic root of 631620613 is about 857.9963327761.

Adding to 631620613 its reverse (316026136), we get a palindrome (947646749).

The spelling of 631620613 in words is "six hundred thirty-one million, six hundred twenty thousand, six hundred thirteen".