631478971 has 2 divisors, whose sum is σ = 631478972. Its totient is φ = 631478970.

The previous prime is 631478933. The next prime is 631478977. The reversal of 631478971 is 179874136.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631478971 is a prime.

It is not a weakly prime, because it can be changed into another prime (631478977) 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, 315739485 + 315739486.

It is an arithmetic number, because the mean of its divisors is an integer number (315739486).

Almost surely, 2^631478971 is an apocalyptic number.

631478971 is a deficient number, since it is larger than the sum of its proper divisors (1).

631478971 is an equidigital number, since it uses as much as digits as its factorization.

631478971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 46.

The square root of 631478971 is about 25129.2453328786. The cubic root of 631478971 is about 857.9321922676.

The spelling of 631478971 in words is "six hundred thirty-one million, four hundred seventy-eight thousand, nine hundred seventy-one".