172011657 has 4 divisors (see below), whose sum is σ = 229348880. Its totient is φ = 114674436.

The previous prime is 172011611. The next prime is 172011667. The reversal of 172011657 is 756110271.

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 172011657 - 2⁸ = 172011401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172011667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28668607 + ... + 28668612.

It is an arithmetic number, because the mean of its divisors is an integer number (57337220).

Almost surely, 2^172011657 is an apocalyptic number.

It is an amenable number.

172011657 is a deficient number, since it is larger than the sum of its proper divisors (57337223).

172011657 is an equidigital number, since it uses as much as digits as its factorization.

172011657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57337222.

The product of its (nonzero) digits is 2940, while the sum is 30.

The square root of 172011657 is about 13115.3214600329. The cubic root of 172011657 is about 556.1423399435.

The spelling of 172011657 in words is "one hundred seventy-two million, eleven thousand, six hundred fifty-seven".