172872291 has 8 divisors (see below), whose sum is σ = 233743104. Its totient is φ = 113624840.

The previous prime is 172872247. The next prime is 172872299. The reversal of 172872291 is 192278271.

172872291 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 172872291 - 2¹⁰ = 172871267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172872299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405591 + ... + 406016.

It is an arithmetic number, because the mean of its divisors is an integer number (29217888).

Almost surely, 2^172872291 is an apocalyptic number.

172872291 is a deficient number, since it is larger than the sum of its proper divisors (60870813).

172872291 is an equidigital number, since it uses as much as digits as its factorization.

172872291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811681.

The product of its digits is 28224, while the sum is 39.

The square root of 172872291 is about 13148.0907739489. The cubic root of 172872291 is about 557.0683216811.

The spelling of 172872291 in words is "one hundred seventy-two million, eight hundred seventy-two thousand, two hundred ninety-one".