631326257 has 4 divisors (see below), whose sum is σ = 631980096. Its totient is φ = 630672420.

The previous prime is 631326247. The next prime is 631326329. The reversal of 631326257 is 752623136.

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 a de Polignac number, because none of the positive numbers 2^k-631326257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631326247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325469 + ... + 327402.

It is an arithmetic number, because the mean of its divisors is an integer number (157995024).

Almost surely, 2^631326257 is an apocalyptic number.

It is an amenable number.

631326257 is a deficient number, since it is larger than the sum of its proper divisors (653839).

631326257 is an equidigital number, since it uses as much as digits as its factorization.

631326257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653838.

The product of its digits is 45360, while the sum is 35.

The square root of 631326257 is about 25126.2065779934. The cubic root of 631326257 is about 857.8630272196.

The spelling of 631326257 in words is "six hundred thirty-one million, three hundred twenty-six thousand, two hundred fifty-seven".