91382257 has 2 divisors, whose sum is σ = 91382258. Its totient is φ = 91382256.

The previous prime is 91382227. The next prime is 91382273. The reversal of 91382257 is 75228319.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47279376 + 44102881 = 6876^2 + 6641^2 .

It is a cyclic number.

It is not a de Polignac number, because 91382257 - 2⁷ = 91382129 is a prime.

It is not a weakly prime, because it can be changed into another prime (91382227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45691128 + 45691129.

It is an arithmetic number, because the mean of its divisors is an integer number (45691129).

Almost surely, 2^91382257 is an apocalyptic number.

It is an amenable number.

91382257 is a deficient number, since it is larger than the sum of its proper divisors (1).

91382257 is an equidigital number, since it uses as much as digits as its factorization.

91382257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 91382257 is about 9559.4067284534. The cubic root of 91382257 is about 450.4230704357.

The spelling of 91382257 in words is "ninety-one million, three hundred eighty-two thousand, two hundred fifty-seven".