172990617 has 16 divisors (see below), whose sum is σ = 232771968. Its totient is φ = 114273920.

The previous prime is 172990579. The next prime is 172990621. The reversal of 172990617 is 716099271.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 172990617 - 2⁸ = 172990361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172990627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183367 + ... + 184307.

It is an arithmetic number, because the mean of its divisors is an integer number (14548248).

Almost surely, 2^172990617 is an apocalyptic number.

It is an amenable number.

172990617 is a deficient number, since it is larger than the sum of its proper divisors (59781351).

172990617 is a wasteful number, since it uses less digits than its factorization.

172990617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1440.

The product of its (nonzero) digits is 47628, while the sum is 42.

The square root of 172990617 is about 13152.5897449894. The cubic root of 172990617 is about 557.1953916556.

The spelling of 172990617 in words is "one hundred seventy-two million, nine hundred ninety thousand, six hundred seventeen".