172713857 has 4 divisors (see below), whose sum is σ = 181804080. Its totient is φ = 163623636.

The previous prime is 172713841. The next prime is 172713869. The reversal of 172713857 is 758317271.

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 a cyclic number.

It is not a de Polignac number, because 172713857 - 2⁴ = 172713841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172713157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4545083 + ... + 4545120.

It is an arithmetic number, because the mean of its divisors is an integer number (45451020).

Almost surely, 2^172713857 is an apocalyptic number.

It is an amenable number.

172713857 is a deficient number, since it is larger than the sum of its proper divisors (9090223).

172713857 is an equidigital number, since it uses as much as digits as its factorization.

172713857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9090222.

The product of its digits is 82320, while the sum is 41.

The square root of 172713857 is about 13142.0644116516. The cubic root of 172713857 is about 556.8980890041.

The spelling of 172713857 in words is "one hundred seventy-two million, seven hundred thirteen thousand, eight hundred fifty-seven".