91301973992 has 16 divisors (see below), whose sum is σ = 173997615300. Its totient is φ = 44902609920.

The previous prime is 91301973949. The next prime is 91301974021. The reversal of 91301973992 is 29937910319.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 72583903396 + 18718070596 = 269414^2 + 136814^2 .

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93546617 + ... + 93547592.

Almost surely, 2^91301973992 is an apocalyptic number.

It is an amenable number.

91301973992 is a deficient number, since it is larger than the sum of its proper divisors (82695641308).

91301973992 is a wasteful number, since it uses less digits than its factorization.

91301973992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187094276 (or 187094272 counting only the distinct ones).

The product of its (nonzero) digits is 826686, while the sum is 53.

The spelling of 91301973992 in words is "ninety-one billion, three hundred one million, nine hundred seventy-three thousand, nine hundred ninety-two".