172025899 has 2 divisors, whose sum is σ = 172025900. Its totient is φ = 172025898.

The previous prime is 172025891. The next prime is 172025921. The reversal of 172025899 is 998520271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172025899 - 2³ = 172025891 is a prime.

It is not a weakly prime, because it can be changed into another prime (172025891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86012949 + 86012950.

It is an arithmetic number, because the mean of its divisors is an integer number (86012950).

Almost surely, 2^172025899 is an apocalyptic number.

172025899 is a deficient number, since it is larger than the sum of its proper divisors (1).

172025899 is an equidigital number, since it uses as much as digits as its factorization.

172025899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 172025899 is about 13115.8644015559. The cubic root of 172025899 is about 556.1576884394.

The spelling of 172025899 in words is "one hundred seventy-two million, twenty-five thousand, eight hundred ninety-nine".