31156000129 has 2 divisors, whose sum is σ = 31156000130. Its totient is φ = 31156000128.

The previous prime is 31156000061. The next prime is 31156000133. The reversal of 31156000129 is 92100065113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24831456400 + 6324543729 = 157580^2 + 79527^2 .

It is a cyclic number.

It is not a de Polignac number, because 31156000129 - 2²⁹ = 30619129217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31156000097 and 31156000106.

It is not a weakly prime, because it can be changed into another prime (31156000159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15578000064 + 15578000065.

It is an arithmetic number, because the mean of its divisors is an integer number (15578000065).

Almost surely, 2^31156000129 is an apocalyptic number.

It is an amenable number.

31156000129 is a deficient number, since it is larger than the sum of its proper divisors (1).

31156000129 is an equidigital number, since it uses as much as digits as its factorization.

31156000129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 28.

The spelling of 31156000129 in words is "thirty-one billion, one hundred fifty-six million, one hundred twenty-nine", and thus it is an aban number.