172025891 has 2 divisors, whose sum is σ = 172025892. Its totient is φ = 172025890.

The previous prime is 172025881. The next prime is 172025899. The reversal of 172025891 is 198520271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172025891 - 2⁶ = 172025827 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (172025899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86012945 + 86012946.

It is an arithmetic number, because the mean of its divisors is an integer number (86012946).

Almost surely, 2^172025891 is an apocalyptic number.

172025891 is a deficient number, since it is larger than the sum of its proper divisors (1).

172025891 is an equidigital number, since it uses as much as digits as its factorization.

172025891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 172025891 is about 13115.8640965817. The cubic root of 172025891 is about 556.1576798181.

The spelling of 172025891 in words is "one hundred seventy-two million, twenty-five thousand, eight hundred ninety-one".