172815155129 has 2 divisors, whose sum is σ = 172815155130. Its totient is φ = 172815155128.

The previous prime is 172815155119. The next prime is 172815155143. The reversal of 172815155129 is 921551518271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135039345529 + 37775809600 = 367477^2 + 194360^2 .

It is a cyclic number.

It is not a de Polignac number, because 172815155129 - 2³² = 168520187833 is a prime.

It is not a weakly prime, because it can be changed into another prime (172815155119) 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, 86407577564 + 86407577565.

It is an arithmetic number, because the mean of its divisors is an integer number (86407577565).

Almost surely, 2^172815155129 is an apocalyptic number.

It is an amenable number.

172815155129 is a deficient number, since it is larger than the sum of its proper divisors (1).

172815155129 is an equidigital number, since it uses as much as digits as its factorization.

172815155129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252000, while the sum is 47.

The spelling of 172815155129 in words is "one hundred seventy-two billion, eight hundred fifteen million, one hundred fifty-five thousand, one hundred twenty-nine".