13121031173 has 2 divisors, whose sum is σ = 13121031174. Its totient is φ = 13121031172.

The previous prime is 13121031167. The next prime is 13121031251. The reversal of 13121031173 is 37113012131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12930646369 + 190384804 = 113713^2 + 13798^2 .

It is a cyclic number.

It is not a de Polignac number, because 13121031173 - 2⁸ = 13121030917 is a prime.

It is a super-2 number, since 2×13121031173² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13121031773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6560515586 + 6560515587.

It is an arithmetic number, because the mean of its divisors is an integer number (6560515587).

Almost surely, 2^13121031173 is an apocalyptic number.

It is an amenable number.

13121031173 is a deficient number, since it is larger than the sum of its proper divisors (1).

13121031173 is an equidigital number, since it uses as much as digits as its factorization.

13121031173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 23.

The spelling of 13121031173 in words is "thirteen billion, one hundred twenty-one million, thirty-one thousand, one hundred seventy-three".