31093157 has 2 divisors, whose sum is σ = 31093158. Its totient is φ = 31093156.

The previous prime is 31093141. The next prime is 31093163. The reversal of 31093157 is 75139013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21520321 + 9572836 = 4639^2 + 3094^2 .

It is a cyclic number.

It is not a de Polignac number, because 31093157 - 2⁴ = 31093141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31096157) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15546578 + 15546579.

It is an arithmetic number, because the mean of its divisors is an integer number (15546579).

Almost surely, 2^31093157 is an apocalyptic number.

It is an amenable number.

31093157 is a deficient number, since it is larger than the sum of its proper divisors (1).

31093157 is an equidigital number, since it uses as much as digits as its factorization.

31093157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2835, while the sum is 29.

The square root of 31093157 is about 5576.1238329148. The cubic root of 31093157 is about 314.4524189490.

The spelling of 31093157 in words is "thirty-one million, ninety-three thousand, one hundred fifty-seven".