79951811 has 4 divisors (see below), whose sum is σ = 82708800. Its totient is φ = 77194824.

The previous prime is 79951769. The next prime is 79951819. The reversal of 79951811 is 11815997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11815997 = 23 ⋅513739.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79951811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79951819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1378451 + ... + 1378508.

It is an arithmetic number, because the mean of its divisors is an integer number (20677200).

Almost surely, 2^79951811 is an apocalyptic number.

79951811 is a deficient number, since it is larger than the sum of its proper divisors (2756989).

79951811 is a wasteful number, since it uses less digits than its factorization.

79951811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2756988.

The product of its digits is 22680, while the sum is 41.

The square root of 79951811 is about 8941.5776572146. The cubic root of 79951811 is about 430.8004039180.

The spelling of 79951811 in words is "seventy-nine million, nine hundred fifty-one thousand, eight hundred eleven".