31018157 has 2 divisors, whose sum is σ = 31018158. Its totient is φ = 31018156.

The previous prime is 31018147. The next prime is 31018159. The reversal of 31018157 is 75181013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29041321 + 1976836 = 5389^2 + 1406^2 .

It is an emirp because it is prime and its reverse (75181013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31018157 - 2⁸ = 31017901 is a prime.

Together with 31018159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31018159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15509078 + 15509079.

It is an arithmetic number, because the mean of its divisors is an integer number (15509079).

Almost surely, 2^31018157 is an apocalyptic number.

It is an amenable number.

31018157 is a deficient number, since it is larger than the sum of its proper divisors (1).

31018157 is an equidigital number, since it uses as much as digits as its factorization.

31018157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 26.

The square root of 31018157 is about 5569.3946708776. The cubic root of 31018157 is about 314.1993845039.

The spelling of 31018157 in words is "thirty-one million, eighteen thousand, one hundred fifty-seven".