91968691 has 8 divisors (see below), whose sum is σ = 97478640. Its totient is φ = 86469888.

The previous prime is 91968677. The next prime is 91968739. The reversal of 91968691 is 19686919.

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

It is not a de Polignac number, because 91968691 - 2⁹ = 91968179 is a prime.

It is a super-3 number, since 3×91968691³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91968631) 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, 19255 + ... + 23551.

It is an arithmetic number, because the mean of its divisors is an integer number (12184830).

Almost surely, 2^91968691 is an apocalyptic number.

91968691 is a deficient number, since it is larger than the sum of its proper divisors (5509949).

91968691 is a wasteful number, since it uses less digits than its factorization.

91968691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5573.

The product of its digits is 209952, while the sum is 49.

The square root of 91968691 is about 9590.0308132977. The cubic root of 91968691 is about 451.3845275860.

The spelling of 91968691 in words is "ninety-one million, nine hundred sixty-eight thousand, six hundred ninety-one".