631164251 has 4 divisors (see below), whose sum is σ = 637413504. Its totient is φ = 624915000.

The previous prime is 631164221. The next prime is 631164271. The reversal of 631164251 is 152461136.

It is a happy number.

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-631164251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631164221) 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, 3124475 + ... + 3124676.

It is an arithmetic number, because the mean of its divisors is an integer number (159353376).

Almost surely, 2^631164251 is an apocalyptic number.

631164251 is a deficient number, since it is larger than the sum of its proper divisors (6249253).

631164251 is a wasteful number, since it uses less digits than its factorization.

631164251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6249252.

The product of its digits is 4320, while the sum is 29.

The square root of 631164251 is about 25122.9825259661. The cubic root of 631164251 is about 857.7896415781.

The spelling of 631164251 in words is "six hundred thirty-one million, one hundred sixty-four thousand, two hundred fifty-one".