631404737489 has 4 divisors (see below), whose sum is σ = 631418256624. Its totient is φ = 631391218356.

The previous prime is 631404737443. The next prime is 631404737503. The reversal of 631404737489 is 984737404136.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 631404737489 - 2³² = 627109770193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631404737389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6689267 + ... + 6783000.

It is an arithmetic number, because the mean of its divisors is an integer number (157854564156).

Almost surely, 2^631404737489 is an apocalyptic number.

It is an amenable number.

631404737489 is a deficient number, since it is larger than the sum of its proper divisors (13519135).

631404737489 is a wasteful number, since it uses less digits than its factorization.

631404737489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13519134.

The product of its (nonzero) digits is 12192768, while the sum is 56.

It can be divided in two parts, 6314047 and 37489, that added together give a palindrome (6351536).

The spelling of 631404737489 in words is "six hundred thirty-one billion, four hundred four million, seven hundred thirty-seven thousand, four hundred eighty-nine".