172051609 has 2 divisors, whose sum is σ = 172051610. Its totient is φ = 172051608.

The previous prime is 172051603. The next prime is 172051681. The reversal of 172051609 is 906150271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155077209 + 16974400 = 12453^2 + 4120^2 .

It is a cyclic number.

It is not a de Polignac number, because 172051609 - 2²³ = 163663001 is a prime.

It is not a weakly prime, because it can be changed into another prime (172051603) 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, 86025804 + 86025805.

It is an arithmetic number, because the mean of its divisors is an integer number (86025805).

Almost surely, 2^172051609 is an apocalyptic number.

It is an amenable number.

172051609 is a deficient number, since it is larger than the sum of its proper divisors (1).

172051609 is an equidigital number, since it uses as much as digits as its factorization.

172051609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 172051609 is about 13116.8444757114. The cubic root of 172051609 is about 556.1853937674.

The spelling of 172051609 in words is "one hundred seventy-two million, fifty-one thousand, six hundred nine".