172798979 has 2 divisors, whose sum is σ = 172798980. Its totient is φ = 172798978.

The previous prime is 172798973. The next prime is 172798987. The reversal of 172798979 is 979897271.

It is a weak prime.

It is an emirp because it is prime and its reverse (979897271) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172798979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (172798973) 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, 86399489 + 86399490.

It is an arithmetic number, because the mean of its divisors is an integer number (86399490).

Almost surely, 2^172798979 is an apocalyptic number.

172798979 is a deficient number, since it is larger than the sum of its proper divisors (1).

172798979 is an equidigital number, since it uses as much as digits as its factorization.

172798979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4000752, while the sum is 59.

The square root of 172798979 is about 13145.3025450158. The cubic root of 172798979 is about 556.9895630262.

The spelling of 172798979 in words is "one hundred seventy-two million, seven hundred ninety-eight thousand, nine hundred seventy-nine".