172391231238155 has 16 divisors (see below), whose sum is σ = 218585319448320. Its totient is φ = 130157621997408.

The previous prime is 172391231238077. The next prime is 172391231238169. The reversal of 172391231238155 is 551832132193271.

It is a cyclic number.

It is not a de Polignac number, because 172391231238155 - 2¹⁶ = 172391231172619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172391231238097 and 172391231238106.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 3449869577 + ... + 3449919546.

It is an arithmetic number, because the mean of its divisors is an integer number (13661582465520).

Almost surely, 2^{172391231238155} is an apocalyptic number.

172391231238155 is a deficient number, since it is larger than the sum of its proper divisors (46194088210165).

172391231238155 is a wasteful number, since it uses less digits than its factorization.

172391231238155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6899789410.

The product of its digits is 2721600, while the sum is 53.

The spelling of 172391231238155 in words is "one hundred seventy-two trillion, three hundred ninety-one billion, two hundred thirty-one million, two hundred thirty-eight thousand, one hundred fifty-five".