78492331 has 2 divisors, whose sum is σ = 78492332. Its totient is φ = 78492330.

The previous prime is 78492313. The next prime is 78492343. The reversal of 78492331 is 13329487.

Together with previous prime (78492313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (13329487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78492331 - 2⁷ = 78492203 is a prime.

It is a super-2 number, since 2×78492331² = 12322092051627122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78492431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39246165 + 39246166.

It is an arithmetic number, because the mean of its divisors is an integer number (39246166).

Almost surely, 2^78492331 is an apocalyptic number.

78492331 is a deficient number, since it is larger than the sum of its proper divisors (1).

78492331 is an equidigital number, since it uses as much as digits as its factorization.

78492331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 37.

The square root of 78492331 is about 8859.5897760562. The cubic root of 78492331 is about 428.1629416425.

The spelling of 78492331 in words is "seventy-eight million, four hundred ninety-two thousand, three hundred thirty-one".