172291089 has 4 divisors (see below), whose sum is σ = 229721456. Its totient is φ = 114860724.

The previous prime is 172291057. The next prime is 172291099. The reversal of 172291089 is 980192271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 172291089 - 2⁵ = 172291057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (172291099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28715179 + ... + 28715184.

It is an arithmetic number, because the mean of its divisors is an integer number (57430364).

Almost surely, 2^172291089 is an apocalyptic number.

It is an amenable number.

172291089 is a deficient number, since it is larger than the sum of its proper divisors (57430367).

172291089 is an equidigital number, since it uses as much as digits as its factorization.

172291089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57430366.

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 172291089 is about 13125.9700212975. The cubic root of 172291089 is about 556.4433270858.

The spelling of 172291089 in words is "one hundred seventy-two million, two hundred ninety-one thousand, eighty-nine".