91081900715 has 16 divisors (see below), whose sum is σ = 118455572928. Its totient is φ = 66832062336.

The previous prime is 91081900709. The next prime is 91081900751. The reversal of 91081900715 is 51700918019.

It is not a de Polignac number, because 91081900715 - 2¹⁰ = 91081899691 is a prime.

It is a super-2 number, since 2×91081900715² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4452407 + ... + 4472816.

It is an arithmetic number, because the mean of its divisors is an integer number (7403473308).

Almost surely, 2^91081900715 is an apocalyptic number.

91081900715 is a deficient number, since it is larger than the sum of its proper divisors (27373672213).

91081900715 is a wasteful number, since it uses less digits than its factorization.

91081900715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8925398.

The product of its (nonzero) digits is 22680, while the sum is 41.

The spelling of 91081900715 in words is "ninety-one billion, eighty-one million, nine hundred thousand, seven hundred fifteen".