78317307231 has 4 divisors (see below), whose sum is σ = 104423076312. Its totient is φ = 52211538152.

The previous prime is 78317307221. The next prime is 78317307247. The reversal of 78317307231 is 13270371387.

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 78317307231 - 2⁹ = 78317306719 is a prime.

It is a super-2 number, since 2×78317307231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78317307221) 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, 13052884536 + ... + 13052884541.

It is an arithmetic number, because the mean of its divisors is an integer number (26105769078).

Almost surely, 2^78317307231 is an apocalyptic number.

78317307231 is a deficient number, since it is larger than the sum of its proper divisors (26105769081).

78317307231 is a wasteful number, since it uses less digits than its factorization.

78317307231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26105769080.

The product of its (nonzero) digits is 148176, while the sum is 42.

The spelling of 78317307231 in words is "seventy-eight billion, three hundred seventeen million, three hundred seven thousand, two hundred thirty-one".