91201940937 has 12 divisors (see below), whose sum is σ = 132113608900. Its totient is φ = 60627076128.

The previous prime is 91201940899. The next prime is 91201940941. The reversal of 91201940937 is 73904910219.

91201940937 is a `hidden beast` number, since 9 + 1 + 201 + 9 + 409 + 37 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 30246775056 + 60955165881 = 173916^2 + 246891^2 .

It is not a de Polignac number, because 91201940937 - 2²⁰ = 91200892361 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91201940892 and 91201940901.

It is not an unprimeable number, because it can be changed into a prime (91201940237) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 14514838 + ... + 14521119.

Almost surely, 2^91201940937 is an apocalyptic number.

It is an amenable number.

91201940937 is a deficient number, since it is larger than the sum of its proper divisors (40911667963).

91201940937 is a wasteful number, since it uses less digits than its factorization.

91201940937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29036312 (or 29036309 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The spelling of 91201940937 in words is "ninety-one billion, two hundred one million, nine hundred forty thousand, nine hundred thirty-seven".