91981158352 has 10 divisors (see below), whose sum is σ = 178213494338. Its totient is φ = 45990579168.

The previous prime is 91981158277. The next prime is 91981158389. The reversal of 91981158352 is 25385118919.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 56356860816 + 35624297536 = 237396^2 + 188744^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 91981158352.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2874411183 + ... + 2874411214.

Almost surely, 2^91981158352 is an apocalyptic number.

It is an amenable number.

91981158352 is a deficient number, since it is larger than the sum of its proper divisors (86232335986).

91981158352 is a wasteful number, since it uses less digits than its factorization.

91981158352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5748822405 (or 5748822399 counting only the distinct ones).

The product of its digits is 777600, while the sum is 52.

The spelling of 91981158352 in words is "ninety-one billion, nine hundred eighty-one million, one hundred fifty-eight thousand, three hundred fifty-two".