172190257 has 4 divisors (see below), whose sum is σ = 172860516. Its totient is φ = 171520000.

The previous prime is 172190237. The next prime is 172190309. The reversal of 172190257 is 752091271.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 168065296 + 4124961 = 12964^2 + 2031^2 .

It is a cyclic number.

It is not a de Polignac number, because 172190257 - 2¹¹ = 172188209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172190237) 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, 334744 + ... + 335257.

It is an arithmetic number, because the mean of its divisors is an integer number (43215129).

Almost surely, 2^172190257 is an apocalyptic number.

It is an amenable number.

172190257 is a deficient number, since it is larger than the sum of its proper divisors (670259).

172190257 is an equidigital number, since it uses as much as digits as its factorization.

172190257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670258.

The product of its (nonzero) digits is 8820, while the sum is 34.

The square root of 172190257 is about 13122.1285239857. The cubic root of 172190257 is about 556.3347545475.

The spelling of 172190257 in words is "one hundred seventy-two million, one hundred ninety thousand, two hundred fifty-seven".