78331 has 4 divisors (see below), whose sum is σ = 85464. Its totient is φ = 71200.

The previous prime is 78317. The next prime is 78341. The reversal of 78331 is 13387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13387 = 11 ⋅1217.

It is a cyclic number.

It is not a de Polignac number, because 78331 - 2⁷ = 78203 is a prime.

It is a super-2 number, since 2×78331² = 12271491122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3550 + ... + 3571.

It is an arithmetic number, because the mean of its divisors is an integer number (21366).

2⁷⁸³³¹ is an apocalyptic number.

78331 is a deficient number, since it is larger than the sum of its proper divisors (7133).

78331 is a wasteful number, since it uses less digits than its factorization.

78331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7132.

The product of its digits is 504, while the sum is 22.

The square root of 78331 is about 279.8767585921. The cubic root of 78331 is about 42.7869395618.

It can be divided in two parts, 7 and 8331, that added together give a palindrome (8338).

The spelling of 78331 in words is "seventy-eight thousand, three hundred thirty-one".