79191985 has 4 divisors (see below), whose sum is σ = 95030388. Its totient is φ = 63353584.

The previous prime is 79191977. The next prime is 79191991. The reversal of 79191985 is 58919197.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58919197 = 67 ⋅879391.

It can be written as a sum of positive squares in 2 ways, for example, as 53699584 + 25492401 = 7328^2 + 5049^2 .

It is a cyclic number.

It is not a de Polignac number, because 79191985 - 2³ = 79191977 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7919194 + ... + 7919203.

It is an arithmetic number, because the mean of its divisors is an integer number (23757597).

Almost surely, 2^79191985 is an apocalyptic number.

It is an amenable number.

79191985 is a deficient number, since it is larger than the sum of its proper divisors (15838403).

79191985 is a wasteful number, since it uses less digits than its factorization.

79191985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15838402.

The product of its digits is 204120, while the sum is 49.

The square root of 79191985 is about 8898.9878637966. The cubic root of 79191985 is about 429.4313467479.

The spelling of 79191985 in words is "seventy-nine million, one hundred ninety-one thousand, nine hundred eighty-five".