172893491 has 4 divisors (see below), whose sum is σ = 174054000. Its totient is φ = 171732984.

The previous prime is 172893481. The next prime is 172893493. The reversal of 172893491 is 194398271.

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

It is a cyclic number.

It is not a de Polignac number, because 172893491 - 2²² = 168699187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172893493) 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, 580031 + ... + 580328.

It is an arithmetic number, because the mean of its divisors is an integer number (43513500).

Almost surely, 2^172893491 is an apocalyptic number.

172893491 is a deficient number, since it is larger than the sum of its proper divisors (1160509).

172893491 is a wasteful number, since it uses less digits than its factorization.

172893491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160508.

The product of its digits is 108864, while the sum is 44.

The square root of 172893491 is about 13148.8969499346. The cubic root of 172893491 is about 557.0910925671.

The spelling of 172893491 in words is "one hundred seventy-two million, eight hundred ninety-three thousand, four hundred ninety-one".