91982309 has 2 divisors, whose sum is σ = 91982310. Its totient is φ = 91982308.

The previous prime is 91982299. The next prime is 91982321. The reversal of 91982309 is 90328919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91259809 + 722500 = 9553^2 + 850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91982309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91982609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45991154 + 45991155.

It is an arithmetic number, because the mean of its divisors is an integer number (45991155).

Almost surely, 2^91982309 is an apocalyptic number.

It is an amenable number.

91982309 is a deficient number, since it is larger than the sum of its proper divisors (1).

91982309 is an equidigital number, since it uses as much as digits as its factorization.

91982309 is an evil number, because the sum of its binary digits is even.

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

The square root of 91982309 is about 9590.7407951628. The cubic root of 91982309 is about 451.4068056427.

The spelling of 91982309 in words is "ninety-one million, nine hundred eighty-two thousand, three hundred nine".