631345157 has 4 divisors (see below), whose sum is σ = 632346336. Its totient is φ = 630343980.

The previous prime is 631345139. The next prime is 631345223. The reversal of 631345157 is 751543136.

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 631345157 - 2⁶ = 631345093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31345157) 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, 499643 + ... + 500904.

It is an arithmetic number, because the mean of its divisors is an integer number (158086584).

Almost surely, 2^631345157 is an apocalyptic number.

It is an amenable number.

631345157 is a deficient number, since it is larger than the sum of its proper divisors (1001179).

631345157 is a wasteful number, since it uses less digits than its factorization.

631345157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001178.

The product of its digits is 37800, while the sum is 35.

The square root of 631345157 is about 25126.5826765201. The cubic root of 631345157 is about 857.8715877430.

The spelling of 631345157 in words is "six hundred thirty-one million, three hundred forty-five thousand, one hundred fifty-seven".