91830979 has 2 divisors, whose sum is σ = 91830980. Its totient is φ = 91830978.

The previous prime is 91830941. The next prime is 91831013. The reversal of 91830979 is 97903819.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91830979 - 2²³ = 83442371 is a prime.

It is not a weakly prime, because it can be changed into another prime (91837979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45915489 + 45915490.

It is an arithmetic number, because the mean of its divisors is an integer number (45915490).

Almost surely, 2^91830979 is an apocalyptic number.

91830979 is a deficient number, since it is larger than the sum of its proper divisors (1).

91830979 is an equidigital number, since it uses as much as digits as its factorization.

91830979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 91830979 is about 9582.8481674291. The cubic root of 91830979 is about 451.1591171141.

The spelling of 91830979 in words is "ninety-one million, eight hundred thirty thousand, nine hundred seventy-nine".