91650257 has 2 divisors, whose sum is σ = 91650258. Its totient is φ = 91650256.

The previous prime is 91650227. The next prime is 91650271. The reversal of 91650257 is 75205619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71301136 + 20349121 = 8444^2 + 4511^2 .

It is a cyclic number.

It is not a de Polignac number, because 91650257 - 2⁸ = 91650001 is a prime.

It is not a weakly prime, because it can be changed into another prime (91650227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45825128 + 45825129.

It is an arithmetic number, because the mean of its divisors is an integer number (45825129).

Almost surely, 2^91650257 is an apocalyptic number.

It is an amenable number.

91650257 is a deficient number, since it is larger than the sum of its proper divisors (1).

91650257 is an equidigital number, since it uses as much as digits as its factorization.

91650257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 91650257 is about 9573.4140723151. The cubic root of 91650257 is about 450.8629646118.

The spelling of 91650257 in words is "ninety-one million, six hundred fifty thousand, two hundred fifty-seven".