172994881 has 4 divisors (see below), whose sum is σ = 174582100. Its totient is φ = 171407664.

The previous prime is 172994851. The next prime is 172994893. The reversal of 172994881 is 188499271.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 61481281 + 111513600 = 7841^2 + 10560^2 .

It is a cyclic number.

It is not a de Polignac number, because 172994881 - 2²¹ = 170897729 is a prime.

It is a super-2 number, since 2×172994881² = 59854457704408322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172994821) 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 3 ways as a sum of consecutive naturals, for example, 793446 + ... + 793663.

It is an arithmetic number, because the mean of its divisors is an integer number (43645525).

Almost surely, 2^172994881 is an apocalyptic number.

It is an amenable number.

172994881 is a deficient number, since it is larger than the sum of its proper divisors (1587219).

172994881 is a wasteful number, since it uses less digits than its factorization.

172994881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1587218.

The product of its digits is 290304, while the sum is 49.

The square root of 172994881 is about 13152.7518413448. The cubic root of 172994881 is about 557.1999696720.

The spelling of 172994881 in words is "one hundred seventy-two million, nine hundred ninety-four thousand, eight hundred eighty-one".