631406311 has 4 divisors (see below), whose sum is σ = 631471192. Its totient is φ = 631341432.

The previous prime is 631406287. The next prime is 631406323. The reversal of 631406311 is 113604136.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 631406311 - 2²⁷ = 497188583 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 (631406351) 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, 14556 + ... + 38401.

It is an arithmetic number, because the mean of its divisors is an integer number (157867798).

Almost surely, 2^631406311 is an apocalyptic number.

631406311 is a deficient number, since it is larger than the sum of its proper divisors (64881).

631406311 is a wasteful number, since it uses less digits than its factorization.

631406311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64880.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 631406311 is about 25127.7995654216. The cubic root of 631406311 is about 857.8992855269.

The spelling of 631406311 in words is "six hundred thirty-one million, four hundred six thousand, three hundred eleven".