79931 has 4 divisors (see below), whose sum is σ = 81192.
Its totient is φ = 78672.
The previous prime is 79907. The next prime is 79939. The reversal of 79931 is 13997.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 79931 - 26 = 79867 is a prime.
It is a super-2 number, since 2×799312 = 12777929522, which contains 22 as substring.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 79894 and 79903.
It is not an unprimeable number, because it can be changed into a prime (79939) 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, 530 + ... + 663.
It is an arithmetic number, because the mean of its divisors is an integer number (20298).
279931 is an apocalyptic number.
79931 is a deficient number, since it is larger than the sum of its proper divisors (1261).
79931 is a wasteful number, since it uses less digits than its factorization.
79931 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1260.
The product of its digits is 1701, while the sum is 29.
The square root of 79931 is about 282.7207102425.
The cubic root of 79931 is about 43.0763022379.
The spelling of 79931 in words is "seventy-nine thousand, nine hundred thirty-one".