631320587 has 2 divisors, whose sum is σ = 631320588. Its totient is φ = 631320586.

The previous prime is 631320559. The next prime is 631320593. The reversal of 631320587 is 785023136.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631320587 - 2⁸ = 631320331 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (631370587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315660293 + 315660294.

It is an arithmetic number, because the mean of its divisors is an integer number (315660294).

Almost surely, 2^631320587 is an apocalyptic number.

631320587 is a deficient number, since it is larger than the sum of its proper divisors (1).

631320587 is an equidigital number, since it uses as much as digits as its factorization.

631320587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 631320587 is about 25126.0937473376. The cubic root of 631320587 is about 857.8604590293.

The spelling of 631320587 in words is "six hundred thirty-one million, three hundred twenty thousand, five hundred eighty-seven".