91883257 has 2 divisors, whose sum is σ = 91883258. Its totient is φ = 91883256.

The previous prime is 91883243. The next prime is 91883299. The reversal of 91883257 is 75238819.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52142841 + 39740416 = 7221^2 + 6304^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91883257 is a prime.

It is not a weakly prime, because it can be changed into another prime (91833257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45941628 + 45941629.

It is an arithmetic number, because the mean of its divisors is an integer number (45941629).

Almost surely, 2^91883257 is an apocalyptic number.

It is an amenable number.

91883257 is a deficient number, since it is larger than the sum of its proper divisors (1).

91883257 is an equidigital number, since it uses as much as digits as its factorization.

91883257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 43.

The square root of 91883257 is about 9585.5754652499. The cubic root of 91883257 is about 451.2447135810.

The spelling of 91883257 in words is "ninety-one million, eight hundred eighty-three thousand, two hundred fifty-seven".