631971323 has 4 divisors (see below), whose sum is σ = 639971040. Its totient is φ = 623971608.

The previous prime is 631971287. The next prime is 631971337. The reversal of 631971323 is 323179136.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631971323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631977323) 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, 3999740 + ... + 3999897.

It is an arithmetic number, because the mean of its divisors is an integer number (159992760).

Almost surely, 2^631971323 is an apocalyptic number.

631971323 is a deficient number, since it is larger than the sum of its proper divisors (7999717).

631971323 is an equidigital number, since it uses as much as digits as its factorization.

631971323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7999716.

The product of its digits is 20412, while the sum is 35.

The square root of 631971323 is about 25139.0398185770. The cubic root of 631971323 is about 858.1551054166.

The spelling of 631971323 in words is "six hundred thirty-one million, nine hundred seventy-one thousand, three hundred twenty-three".