172055687 has 4 divisors (see below), whose sum is σ = 172566576. Its totient is φ = 171544800.

The previous prime is 172055669. The next prime is 172055701. The reversal of 172055687 is 786550271.

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 172055687 - 2¹⁶ = 171990151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172055627) 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, 254939 + ... + 255612.

It is an arithmetic number, because the mean of its divisors is an integer number (43141644).

Almost surely, 2^172055687 is an apocalyptic number.

172055687 is a deficient number, since it is larger than the sum of its proper divisors (510889).

172055687 is an equidigital number, since it uses as much as digits as its factorization.

172055687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510888.

The product of its (nonzero) digits is 117600, while the sum is 41.

The square root of 172055687 is about 13116.9999237631. Note that the first 4 decimals coincide. The cubic root of 172055687 is about 556.1897880034.

The spelling of 172055687 in words is "one hundred seventy-two million, fifty-five thousand, six hundred eighty-seven".