78412231 has 2 divisors, whose sum is σ = 78412232. Its totient is φ = 78412230.

The previous prime is 78412199. The next prime is 78412241. The reversal of 78412231 is 13221487.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78412231 - 2⁵ = 78412199 is a prime.

It is a super-2 number, since 2×78412231² = 12296955940794722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78412231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78412241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39206115 + 39206116.

It is an arithmetic number, because the mean of its divisors is an integer number (39206116).

Almost surely, 2^78412231 is an apocalyptic number.

78412231 is a deficient number, since it is larger than the sum of its proper divisors (1).

78412231 is an equidigital number, since it uses as much as digits as its factorization.

78412231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 28.

The square root of 78412231 is about 8855.0680968584. The cubic root of 78412231 is about 428.0172479001.

The spelling of 78412231 in words is "seventy-eight million, four hundred twelve thousand, two hundred thirty-one".