91830331 has 2 divisors, whose sum is σ = 91830332. Its totient is φ = 91830330.

The previous prime is 91830313. The next prime is 91830391. The reversal of 91830331 is 13303819.

Together with previous prime (91830313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91830331 - 2¹⁷ = 91699259 is a prime.

It is a super-2 number, since 2×91830331² = 16865619383139122, 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 91830331.

It is not a weakly prime, because it can be changed into another prime (91830391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45915165 + 45915166.

It is an arithmetic number, because the mean of its divisors is an integer number (45915166).

Almost surely, 2^91830331 is an apocalyptic number.

91830331 is a deficient number, since it is larger than the sum of its proper divisors (1).

91830331 is an equidigital number, since it uses as much as digits as its factorization.

91830331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 91830331 is about 9582.8143569622. The cubic root of 91830331 is about 451.1580559188.

The spelling of 91830331 in words is "ninety-one million, eight hundred thirty thousand, three hundred thirty-one".