172131045 has 16 divisors (see below), whose sum is σ = 275996160. Its totient is φ = 91607744.

The previous prime is 172131023. The next prime is 172131077. The reversal of 172131045 is 540131271.

It is a cyclic number.

It is not a de Polignac number, because 172131045 - 2⁹ = 172130533 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4794 + ... + 19163.

It is an arithmetic number, because the mean of its divisors is an integer number (17249760).

Almost surely, 2^172131045 is an apocalyptic number.

172131045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

172131045 is a deficient number, since it is larger than the sum of its proper divisors (103865115).

172131045 is a wasteful number, since it uses less digits than its factorization.

172131045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24444.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 172131045 is about 13119.8721411453. The cubic root of 172131045 is about 556.2709772841.

The spelling of 172131045 in words is "one hundred seventy-two million, one hundred thirty-one thousand, forty-five".