7865979131 has 4 divisors (see below), whose sum is σ = 7888262712. Its totient is φ = 7843695552.

The previous prime is 7865979113. The next prime is 7865979137. The reversal of 7865979131 is 1319795687.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7865979131 is a prime.

It is a super-2 number, since 2×7865979131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7865979137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11141261 + ... + 11141966.

It is an arithmetic number, because the mean of its divisors is an integer number (1972065678).

Almost surely, 2^7865979131 is an apocalyptic number.

7865979131 is a deficient number, since it is larger than the sum of its proper divisors (22283581).

7865979131 is a wasteful number, since it uses less digits than its factorization.

7865979131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22283580.

The product of its digits is 2857680, while the sum is 56.

The square root of 7865979131 is about 88690.3553437464. The cubic root of 7865979131 is about 1988.7686405965.

The spelling of 7865979131 in words is "seven billion, eight hundred sixty-five million, nine hundred seventy-nine thousand, one hundred thirty-one".