91900449 has 12 divisors (see below), whose sum is σ = 137322900. Its totient is φ = 59154144.

The previous prime is 91900439. The next prime is 91900451. The reversal of 91900449 is 94400919.

It can be written as a sum of positive squares in 2 ways, for example, as 46580625 + 45319824 = 6825^2 + 6732^2 .

It is not a de Polignac number, because 91900449 - 2⁹ = 91899937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91900409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 175794 + ... + 176315.

It is an arithmetic number, because the mean of its divisors is an integer number (11443575).

Almost surely, 2^91900449 is an apocalyptic number.

It is an amenable number.

91900449 is a deficient number, since it is larger than the sum of its proper divisors (45422451).

91900449 is a wasteful number, since it uses less digits than its factorization.

91900449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352144 (or 352141 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 91900449 is about 9586.4721874108. The cubic root of 91900449 is about 451.2728555066.

The spelling of 91900449 in words is "ninety-one million, nine hundred thousand, four hundred forty-nine".