31186482157 has 2 divisors, whose sum is σ = 31186482158. Its totient is φ = 31186482156.

The previous prime is 31186482149. The next prime is 31186482169. The reversal of 31186482157 is 75128468113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29728311561 + 1458170596 = 172419^2 + 38186^2 .

It is a cyclic number.

It is not a de Polignac number, because 31186482157 - 2³ = 31186482149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31186482127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15593241078 + 15593241079.

It is an arithmetic number, because the mean of its divisors is an integer number (15593241079).

Almost surely, 2^31186482157 is an apocalyptic number.

It is an amenable number.

31186482157 is a deficient number, since it is larger than the sum of its proper divisors (1).

31186482157 is an equidigital number, since it uses as much as digits as its factorization.

31186482157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 46.

The spelling of 31186482157 in words is "thirty-one billion, one hundred eighty-six million, four hundred eighty-two thousand, one hundred fifty-seven".