78163231 has 2 divisors, whose sum is σ = 78163232. Its totient is φ = 78163230.

The previous prime is 78163213. The next prime is 78163237. The reversal of 78163231 is 13236187.

Together with previous prime (78163213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78163231 - 2⁷ = 78163103 is a prime.

It is a super-2 number, since 2×78163231² = 12218981360718722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78163193 and 78163202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78163237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39081615 + 39081616.

It is an arithmetic number, because the mean of its divisors is an integer number (39081616).

Almost surely, 2^78163231 is an apocalyptic number.

78163231 is a deficient number, since it is larger than the sum of its proper divisors (1).

78163231 is an equidigital number, since it uses as much as digits as its factorization.

78163231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 31.

The square root of 78163231 is about 8840.9971722651. The cubic root of 78163231 is about 427.5637076607.

The spelling of 78163231 in words is "seventy-eight million, one hundred sixty-three thousand, two hundred thirty-one".