172002155 has 16 divisors (see below), whose sum is σ = 233980320. Its totient is φ = 120331008.

The previous prime is 172002139. The next prime is 172002163. The reversal of 172002155 is 551200271.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 172002155 - 2⁴ = 172002139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172002155.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68402 + ... + 70871.

It is an arithmetic number, because the mean of its divisors is an integer number (14623770).

Almost surely, 2^172002155 is an apocalyptic number.

172002155 is a deficient number, since it is larger than the sum of its proper divisors (61978165).

172002155 is a wasteful number, since it uses less digits than its factorization.

172002155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139310.

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 172002155 is about 13114.9592069514. The cubic root of 172002155 is about 556.1320992387.

The spelling of 172002155 in words is "one hundred seventy-two million, two thousand, one hundred fifty-five".