631326329 has 2 divisors, whose sum is σ = 631326330. Its totient is φ = 631326328.

The previous prime is 631326247. The next prime is 631326337. The reversal of 631326329 is 923623136.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 331240000 + 300086329 = 18200^2 + 17323^2 .

It is a cyclic number.

It is not a de Polignac number, because 631326329 - 2²⁸ = 362890873 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (631326389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315663164 + 315663165.

It is an arithmetic number, because the mean of its divisors is an integer number (315663165).

Almost surely, 2^631326329 is an apocalyptic number.

It is an amenable number.

631326329 is a deficient number, since it is larger than the sum of its proper divisors (1).

631326329 is an equidigital number, since it uses as much as digits as its factorization.

631326329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 35.

The square root of 631326329 is about 25126.2080107604. The cubic root of 631326329 is about 857.8630598315.

The spelling of 631326329 in words is "six hundred thirty-one million, three hundred twenty-six thousand, three hundred twenty-nine".