631404731 has 2 divisors, whose sum is σ = 631404732. Its totient is φ = 631404730.

The previous prime is 631404703. The next prime is 631404743. The reversal of 631404731 is 137404136.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631404731 - 2¹⁸ = 631142587 is a prime.

It is a super-2 number, since 2×631404731² = 797343868658364722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 631404694 and 631404703.

It is not a weakly prime, because it can be changed into another prime (631404031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315702365 + 315702366.

It is an arithmetic number, because the mean of its divisors is an integer number (315702366).

Almost surely, 2^631404731 is an apocalyptic number.

631404731 is a deficient number, since it is larger than the sum of its proper divisors (1).

631404731 is an equidigital number, since it uses as much as digits as its factorization.

631404731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 631404731 is about 25127.7681261190. The cubic root of 631404731 is about 857.8985699380.

Adding to 631404731 its reverse (137404136), we get a palindrome (768808867).

The spelling of 631404731 in words is "six hundred thirty-one million, four hundred four thousand, seven hundred thirty-one".