631512893 has 4 divisors (see below), whose sum is σ = 688923168. Its totient is φ = 574102620.

The previous prime is 631512881. The next prime is 631512901. The reversal of 631512893 is 398215136.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 631512893 - 2⁶ = 631512829 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 (631512803) 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, 28705121 + ... + 28705142.

It is an arithmetic number, because the mean of its divisors is an integer number (172230792).

Almost surely, 2^631512893 is an apocalyptic number.

It is an amenable number.

631512893 is a deficient number, since it is larger than the sum of its proper divisors (57410275).

631512893 is a wasteful number, since it uses less digits than its factorization.

631512893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57410274.

The product of its digits is 38880, while the sum is 38.

The square root of 631512893 is about 25129.9202744458. The cubic root of 631512893 is about 857.9475542226.

The spelling of 631512893 in words is "six hundred thirty-one million, five hundred twelve thousand, eight hundred ninety-three".