91973704090 has 16 divisors (see below), whose sum is σ = 165914935272. Its totient is φ = 36708977664.

The previous prime is 91973704063. The next prime is 91973704103. The reversal of 91973704090 is 9040737919.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 81843482889 + 10130221201 = 286083^2 + 100649^2 .

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 7 ways as a sum of consecutive naturals, for example, 10058199 + ... + 10067338.

Almost surely, 2^91973704090 is an apocalyptic number.

91973704090 is a deficient number, since it is larger than the sum of its proper divisors (73941231182).

91973704090 is a wasteful number, since it uses less digits than its factorization.

91973704090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20126001.

The product of its (nonzero) digits is 428652, while the sum is 49.

The spelling of 91973704090 in words is "ninety-one billion, nine hundred seventy-three million, seven hundred four thousand, ninety".