78131 has 8 divisors (see below), whose sum is σ = 84480. Its totient is φ = 72072.

The previous prime is 78121. The next prime is 78137. The reversal of 78131 is 13187.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78131 is a prime.

It is a super-2 number, since 2×78131² = 12208906322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78137) 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, 950 + ... + 1028.

It is an arithmetic number, because the mean of its divisors is an integer number (10560).

2⁷⁸¹³¹ is an apocalyptic number.

78131 is a deficient number, since it is larger than the sum of its proper divisors (6349).

78131 is a wasteful number, since it uses less digits than its factorization.

78131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145.

The product of its digits is 168, while the sum is 20.

The square root of 78131 is about 279.5192301077. The cubic root of 78131 is about 42.7504930235.

The spelling of 78131 in words is "seventy-eight thousand, one hundred thirty-one".