79311818 has 4 divisors (see below), whose sum is σ = 118967730. Its totient is φ = 39655908.

The previous prime is 79311803. The next prime is 79311821. The reversal of 79311818 is 81811397.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81811397 = 19 ⋅4305863.

It can be written as a sum of positive squares in only one way, i.e., 43467649 + 35844169 = 6593^2 + 5987^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19827953 + ... + 19827956.

Almost surely, 2^79311818 is an apocalyptic number.

79311818 is a deficient number, since it is larger than the sum of its proper divisors (39655912).

79311818 is a wasteful number, since it uses less digits than its factorization.

79311818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39655911.

The product of its digits is 12096, while the sum is 38.

The square root of 79311818 is about 8905.7182753554. The cubic root of 79311818 is about 429.6478421925.

The spelling of 79311818 in words is "seventy-nine million, three hundred eleven thousand, eight hundred eighteen".