91974893 has 8 divisors (see below), whose sum is σ = 94298688. Its totient is φ = 89659584.

The previous prime is 91974889. The next prime is 91974899. The reversal of 91974893 is 39847919.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91974893 - 2² = 91974889 is a prime.

It is a super-2 number, since 2×91974893² = 16918761884722898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91974899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23696 + ... + 27302.

It is an arithmetic number, because the mean of its divisors is an integer number (11787336).

Almost surely, 2^91974893 is an apocalyptic number.

It is an amenable number.

91974893 is a deficient number, since it is larger than the sum of its proper divisors (2323795).

91974893 is a wasteful number, since it uses less digits than its factorization.

91974893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4243.

The product of its digits is 489888, while the sum is 50.

The square root of 91974893 is about 9590.3541644717. The cubic root of 91974893 is about 451.3946738792.

The spelling of 91974893 in words is "ninety-one million, nine hundred seventy-four thousand, eight hundred ninety-three".