172285979 has 2 divisors, whose sum is σ = 172285980. Its totient is φ = 172285978.

The previous prime is 172285969. The next prime is 172286047. The reversal of 172285979 is 979582271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172285979 - 2¹² = 172281883 is a prime.

It is not a weakly prime, because it can be changed into another prime (172285969) 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, 86142989 + 86142990.

It is an arithmetic number, because the mean of its divisors is an integer number (86142990).

Almost surely, 2^172285979 is an apocalyptic number.

172285979 is a deficient number, since it is larger than the sum of its proper divisors (1).

172285979 is an equidigital number, since it uses as much as digits as its factorization.

172285979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 50.

The square root of 172285979 is about 13125.7753675735. The cubic root of 172285979 is about 556.4378258272.

The spelling of 172285979 in words is "one hundred seventy-two million, two hundred eighty-five thousand, nine hundred seventy-nine".