91900849 has 2 divisors, whose sum is σ = 91900850. Its totient is φ = 91900848.

The previous prime is 91900841. The next prime is 91900873. The reversal of 91900849 is 94800919.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91011600 + 889249 = 9540^2 + 943^2 .

It is a cyclic number.

It is not a de Polignac number, because 91900849 - 2³ = 91900841 is a prime.

It is not a weakly prime, because it can be changed into another prime (91900841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45950424 + 45950425.

It is an arithmetic number, because the mean of its divisors is an integer number (45950425).

Almost surely, 2^91900849 is an apocalyptic number.

It is an amenable number.

91900849 is a deficient number, since it is larger than the sum of its proper divisors (1).

91900849 is an equidigital number, since it uses as much as digits as its factorization.

91900849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 91900849 is about 9586.4930501200. The cubic root of 91900849 is about 451.2735102327.

The spelling of 91900849 in words is "ninety-one million, nine hundred thousand, eight hundred forty-nine".