631386311 has 4 divisors (see below), whose sum is σ = 632844912. Its totient is φ = 629927712.

The previous prime is 631386299. The next prime is 631386319. The reversal of 631386311 is 113683136.

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-631386311 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 (631386319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 728651 + ... + 729516.

It is an arithmetic number, because the mean of its divisors is an integer number (158211228).

Almost surely, 2^631386311 is an apocalyptic number.

631386311 is a deficient number, since it is larger than the sum of its proper divisors (1458601).

631386311 is a wasteful number, since it uses less digits than its factorization.

631386311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458600.

The product of its digits is 7776, while the sum is 32.

The square root of 631386311 is about 25127.4015966634. The cubic root of 631386311 is about 857.8902273518.

The spelling of 631386311 in words is "six hundred thirty-one million, three hundred eighty-six thousand, three hundred eleven".