91742481 has 6 divisors (see below), whose sum is σ = 132516930. Its totient is φ = 61161648.

The previous prime is 91742471. The next prime is 91742501. The reversal of 91742481 is 18424719.

91742481 is a `hidden beast` number, since 9 + 174 + 2 + 481 = 666.

It can be written as a sum of positive squares in only one way, i.e., 60840000 + 30902481 = 7800^2 + 5559^2 .

It is not a de Polignac number, because 91742481 - 2¹³ = 91734289 is a prime.

It is a super-2 number, since 2×91742481² = 16833365640070722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91742401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5096796 + ... + 5096813.

It is an arithmetic number, because the mean of its divisors is an integer number (22086155).

Almost surely, 2^91742481 is an apocalyptic number.

It is an amenable number.

91742481 is a deficient number, since it is larger than the sum of its proper divisors (40774449).

91742481 is a wasteful number, since it uses less digits than its factorization.

91742481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10193615 (or 10193612 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 91742481 is about 9578.2295336873. The cubic root of 91742481 is about 451.0141423910.

The spelling of 91742481 in words is "ninety-one million, seven hundred forty-two thousand, four hundred eighty-one".