31020232157 has 2 divisors, whose sum is σ = 31020232158. Its totient is φ = 31020232156.

The previous prime is 31020232109. The next prime is 31020232169. The reversal of 31020232157 is 75123202013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30160921561 + 859310596 = 173669^2 + 29314^2 .

It is a cyclic number.

It is not a de Polignac number, because 31020232157 - 2⁶ = 31020232093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31020232357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15510116078 + 15510116079.

It is an arithmetic number, because the mean of its divisors is an integer number (15510116079).

Almost surely, 2^31020232157 is an apocalyptic number.

It is an amenable number.

31020232157 is a deficient number, since it is larger than the sum of its proper divisors (1).

31020232157 is an equidigital number, since it uses as much as digits as its factorization.

31020232157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 26.

The spelling of 31020232157 in words is "thirty-one billion, twenty million, two hundred thirty-two thousand, one hundred fifty-seven".