631157 has 2 divisors, whose sum is σ = 631158. Its totient is φ = 631156.

The previous prime is 631153. The next prime is 631171. The reversal of 631157 is 751136.

631157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 625681 + 5476 = 791^2 + 74^2 .

It is a cyclic number.

It is not a de Polignac number, because 631157 - 2² = 631153 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (631151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315578 + 315579.

It is an arithmetic number, because the mean of its divisors is an integer number (315579).

2⁶³¹¹⁵⁷ is an apocalyptic number.

It is an amenable number.

631157 is a deficient number, since it is larger than the sum of its proper divisors (1).

631157 is an equidigital number, since it uses as much as digits as its factorization.

631157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 630, while the sum is 23.

The square root of 631157 is about 794.4539004876. The cubic root of 631157 is about 85.7786356719.

The spelling of 631157 in words is "six hundred thirty-one thousand, one hundred fifty-seven".