631578047 has 2 divisors, whose sum is σ = 631578048. Its totient is φ = 631578046.

The previous prime is 631578043. The next prime is 631578127. The reversal of 631578047 is 740875136.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 631578047 - 2² = 631578043 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 631577995 and 631578013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631578043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315789023 + 315789024.

It is an arithmetic number, because the mean of its divisors is an integer number (315789024).

Almost surely, 2^631578047 is an apocalyptic number.

631578047 is a deficient number, since it is larger than the sum of its proper divisors (1).

631578047 is an equidigital number, since it uses as much as digits as its factorization.

631578047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 631578047 is about 25131.2165841608. The cubic root of 631578047 is about 857.9770583934.

The spelling of 631578047 in words is "six hundred thirty-one million, five hundred seventy-eight thousand, forty-seven".