172991795 has 8 divisors (see below), whose sum is σ = 212418096. Its totient is φ = 135174816.

The previous prime is 172991759. The next prime is 172991803. The reversal of 172991795 is 597199271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172991795 - 2²² = 168797491 is a prime.

It is a super-2 number, since 2×172991795² = 59852322274644050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 402092 + ... + 402521.

It is an arithmetic number, because the mean of its divisors is an integer number (26552262).

Almost surely, 2^172991795 is an apocalyptic number.

172991795 is a deficient number, since it is larger than the sum of its proper divisors (39426301).

172991795 is an equidigital number, since it uses as much as digits as its factorization.

172991795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804661.

The product of its digits is 357210, while the sum is 50.

The square root of 172991795 is about 13152.6345269684. The cubic root of 172991795 is about 557.1966564153.

The spelling of 172991795 in words is "one hundred seventy-two million, nine hundred ninety-one thousand, seven hundred ninety-five".