78999131 has 8 divisors (see below), whose sum is σ = 84211200. Its totient is φ = 73892520.

The previous prime is 78999059. The next prime is 78999133. The reversal of 78999131 is 13199987.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78999131 - 2¹⁰ = 78998107 is a prime.

It is a super-2 number, since 2×78999131² = 12481725397510322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78999133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24815 + ... + 27816.

It is an arithmetic number, because the mean of its divisors is an integer number (10526400).

Almost surely, 2^78999131 is an apocalyptic number.

78999131 is a deficient number, since it is larger than the sum of its proper divisors (5212069).

78999131 is a wasteful number, since it uses less digits than its factorization.

78999131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52729.

The product of its digits is 122472, while the sum is 47.

The square root of 78999131 is about 8888.1455321119. The cubic root of 78999131 is about 429.0824693887.

The spelling of 78999131 in words is "seventy-eight million, nine hundred ninety-nine thousand, one hundred thirty-one".