172158965 has 32 divisors (see below), whose sum is σ = 239016960. Its totient is φ = 117849600.

The previous prime is 172158947. The next prime is 172158967. The reversal of 172158965 is 569851271.

It is not a de Polignac number, because 172158965 - 2¹⁰ = 172157941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172158967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61721 + ... + 64449.

It is an arithmetic number, because the mean of its divisors is an integer number (7469280).

Almost surely, 2^172158965 is an apocalyptic number.

It is an amenable number.

172158965 is a deficient number, since it is larger than the sum of its proper divisors (66857995).

172158965 is a wasteful number, since it uses less digits than its factorization.

172158965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2813.

The product of its digits is 151200, while the sum is 44.

The square root of 172158965 is about 13120.9361327613. The cubic root of 172158965 is about 556.3010517467.

The spelling of 172158965 in words is "one hundred seventy-two million, one hundred fifty-eight thousand, nine hundred sixty-five".