91890329 has 2 divisors, whose sum is σ = 91890330. Its totient is φ = 91890328.

The previous prime is 91890263. The next prime is 91890349. The reversal of 91890329 is 92309819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64432729 + 27457600 = 8027^2 + 5240^2 .

It is a cyclic number.

It is not a de Polignac number, because 91890329 - 2²⁰ = 90841753 is a prime.

It is not a weakly prime, because it can be changed into another prime (91890349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45945164 + 45945165.

It is an arithmetic number, because the mean of its divisors is an integer number (45945165).

Almost surely, 2^91890329 is an apocalyptic number.

It is an amenable number.

91890329 is a deficient number, since it is larger than the sum of its proper divisors (1).

91890329 is an equidigital number, since it uses as much as digits as its factorization.

91890329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 91890329 is about 9585.9443457596. The cubic root of 91890329 is about 451.2562903030.

The spelling of 91890329 in words is "ninety-one million, eight hundred ninety thousand, three hundred twenty-nine".