631085971 has 2 divisors, whose sum is σ = 631085972. Its totient is φ = 631085970.

The previous prime is 631085933. The next prime is 631086031. The reversal of 631085971 is 179580136.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 631085971 - 2²¹ = 628988819 is a prime.

It is a super-3 number, since 3×631085971³ (a number of 27 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (631085921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315542985 + 315542986.

It is an arithmetic number, because the mean of its divisors is an integer number (315542986).

Almost surely, 2^631085971 is an apocalyptic number.

631085971 is a deficient number, since it is larger than the sum of its proper divisors (1).

631085971 is an equidigital number, since it uses as much as digits as its factorization.

631085971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 631085971 is about 25121.4245416139. The cubic root of 631085971 is about 857.7541777247.

The spelling of 631085971 in words is "six hundred thirty-one million, eighty-five thousand, nine hundred seventy-one".