631982987 has 2 divisors, whose sum is σ = 631982988. Its totient is φ = 631982986.

The previous prime is 631982969. The next prime is 631983031. The reversal of 631982987 is 789289136.

631982987 is nontrivially palindromic in base 5.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 631982987 - 2¹⁰ = 631981963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (631982947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315991493 + 315991494.

It is an arithmetic number, because the mean of its divisors is an integer number (315991494).

Almost surely, 2^631982987 is an apocalyptic number.

631982987 is a deficient number, since it is larger than the sum of its proper divisors (1).

631982987 is an equidigital number, since it uses as much as digits as its factorization.

631982987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 53.

The square root of 631982987 is about 25139.2718072740. The cubic root of 631982987 is about 858.1603849070.

The spelling of 631982987 in words is "six hundred thirty-one million, nine hundred eighty-two thousand, nine hundred eighty-seven".