79975217 has 4 divisors (see below), whose sum is σ = 91400256. Its totient is φ = 68550180.

The previous prime is 79975213. The next prime is 79975249. The reversal of 79975217 is 71257997.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71257997 = 1181 ⋅60337.

It is a cyclic number.

It is not a de Polignac number, because 79975217 - 2² = 79975213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79975211) 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 in 3 ways as a sum of consecutive naturals, for example, 5712509 + ... + 5712522.

It is an arithmetic number, because the mean of its divisors is an integer number (22850064).

Almost surely, 2^79975217 is an apocalyptic number.

It is an amenable number.

79975217 is a deficient number, since it is larger than the sum of its proper divisors (11425039).

79975217 is a wasteful number, since it uses less digits than its factorization.

79975217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11425038.

The product of its digits is 277830, while the sum is 47.

The square root of 79975217 is about 8942.8863908696. The cubic root of 79975217 is about 430.8424389485.

The spelling of 79975217 in words is "seventy-nine million, nine hundred seventy-five thousand, two hundred seventeen".