79217969 has 2 divisors, whose sum is σ = 79217970. Its totient is φ = 79217968.

The previous prime is 79217959. The next prime is 79218001. The reversal of 79217969 is 96971297.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51265600 + 27952369 = 7160^2 + 5287^2 .

It is an emirp because it is prime and its reverse (96971297) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79217969 - 2¹² = 79213873 is a prime.

It is a super-2 number, since 2×79217969² = 12550973224969922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79217959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39608984 + 39608985.

It is an arithmetic number, because the mean of its divisors is an integer number (39608985).

Almost surely, 2^79217969 is an apocalyptic number.

It is an amenable number.

79217969 is a deficient number, since it is larger than the sum of its proper divisors (1).

79217969 is an equidigital number, since it uses as much as digits as its factorization.

79217969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 428652, while the sum is 50.

The square root of 79217969 is about 8900.4476853695. The cubic root of 79217969 is about 429.4783090928.

The spelling of 79217969 in words is "seventy-nine million, two hundred seventeen thousand, nine hundred sixty-nine".