91849874517 has 12 divisors (see below), whose sum is σ = 136257772300. Its totient is φ = 59578296768.

The previous prime is 91849874497. The next prime is 91849874527. The reversal of 91849874517 is 71547894819.

91849874517 is a `hidden beast` number, since 9 + 1 + 8 + 49 + 8 + 74 + 517 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 49628255076 + 42221619441 = 222774^2 + 205479^2 .

It is not a de Polignac number, because 91849874517 - 2⁶ = 91849874453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91849874527) 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, 137912392 + ... + 137913057.

Almost surely, 2^91849874517 is an apocalyptic number.

It is an amenable number.

91849874517 is a deficient number, since it is larger than the sum of its proper divisors (44407897783).

91849874517 is a wasteful number, since it uses less digits than its factorization.

91849874517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275825492 (or 275825489 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 63.

The spelling of 91849874517 in words is "ninety-one billion, eight hundred forty-nine million, eight hundred seventy-four thousand, five hundred seventeen".