172705157 has 8 divisors (see below), whose sum is σ = 179213760. Its totient is φ = 166309920.

The previous prime is 172705153. The next prime is 172705177. The reversal of 172705157 is 751507271.

It is a happy number.

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 172705157 - 2² = 172705153 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 (172705153) 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, 25232 + ... + 31337.

It is an arithmetic number, because the mean of its divisors is an integer number (22401720).

Almost surely, 2^172705157 is an apocalyptic number.

It is an amenable number.

172705157 is a deficient number, since it is larger than the sum of its proper divisors (6508603).

172705157 is an equidigital number, since it uses as much as digits as its factorization.

172705157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56683.

The product of its (nonzero) digits is 17150, while the sum is 35.

The square root of 172705157 is about 13141.7334092577. The cubic root of 172705157 is about 556.8887380950. Note that the first 3 decimals are identical.

The spelling of 172705157 in words is "one hundred seventy-two million, seven hundred five thousand, one hundred fifty-seven".