631655035213 has 4 divisors (see below), whose sum is σ = 631656711100. Its totient is φ = 631653359328.

The previous prime is 631655035181. The next prime is 631655035237. The reversal of 631655035213 is 312530556136.

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 185508519849 + 446146515364 = 430707^2 + 667942^2 .

It is a cyclic number.

It is not a de Polignac number, because 631655035213 - 2⁵ = 631655035181 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 (631655033213) 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, 20713 + ... + 1124161.

It is an arithmetic number, because the mean of its divisors is an integer number (157914177775).

Almost surely, 2^631655035213 is an apocalyptic number.

It is an amenable number.

631655035213 is a deficient number, since it is larger than the sum of its proper divisors (1675887).

631655035213 is a wasteful number, since it uses less digits than its factorization.

631655035213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1675886.

The product of its (nonzero) digits is 243000, while the sum is 40.

The spelling of 631655035213 in words is "six hundred thirty-one billion, six hundred fifty-five million, thirty-five thousand, two hundred thirteen".