79986131 has 2 divisors, whose sum is σ = 79986132. Its totient is φ = 79986130.

The previous prime is 79986113. The next prime is 79986133. The reversal of 79986131 is 13168997.

Together with previous prime (79986113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79986131 - 2¹⁰ = 79985107 is a prime.

It is a super-2 number, since 2×79986131² = 12795562304698322, which contains 22 as substring.

Together with 79986133, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79986133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39993065 + 39993066.

It is an arithmetic number, because the mean of its divisors is an integer number (39993066).

Almost surely, 2^79986131 is an apocalyptic number.

79986131 is the 4781-st centered heptagonal number.

79986131 is a deficient number, since it is larger than the sum of its proper divisors (1).

79986131 is an equidigital number, since it uses as much as digits as its factorization.

79986131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 44.

The square root of 79986131 is about 8943.4965757247. The cubic root of 79986131 is about 430.8620366884.

The spelling of 79986131 in words is "seventy-nine million, nine hundred eighty-six thousand, one hundred thirty-one".