631540807 has 2 divisors, whose sum is σ = 631540808. Its totient is φ = 631540806.

The previous prime is 631540799. The next prime is 631540813. The reversal of 631540807 is 708045136.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631540807 - 2³ = 631540799 is a prime.

It is a super-2 number, since 2×631540807² = 797687581812422498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631540817) 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 as a sum of consecutive naturals, namely, 315770403 + 315770404.

It is an arithmetic number, because the mean of its divisors is an integer number (315770404).

Almost surely, 2^631540807 is an apocalyptic number.

631540807 is a deficient number, since it is larger than the sum of its proper divisors (1).

631540807 is an equidigital number, since it uses as much as digits as its factorization.

631540807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 631540807 is about 25130.4756620323. The cubic root of 631540807 is about 857.9601949754.

The spelling of 631540807 in words is "six hundred thirty-one million, five hundred forty thousand, eight hundred seven".