78255431 has 2 divisors, whose sum is σ = 78255432. Its totient is φ = 78255430.

The previous prime is 78255421. The next prime is 78255451. The reversal of 78255431 is 13455287.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78255431 - 2⁶ = 78255367 is a prime.

It is a super-2 number, since 2×78255431² = 12247824961991522, 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 = 78255391 and 78255400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78255421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39127715 + 39127716.

It is an arithmetic number, because the mean of its divisors is an integer number (39127716).

Almost surely, 2^78255431 is an apocalyptic number.

78255431 is a deficient number, since it is larger than the sum of its proper divisors (1).

78255431 is an equidigital number, since it uses as much as digits as its factorization.

78255431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33600, while the sum is 35.

The square root of 78255431 is about 8846.2099794206. The cubic root of 78255431 is about 427.7317571951.

The spelling of 78255431 in words is "seventy-eight million, two hundred fifty-five thousand, four hundred thirty-one".