91421996 has 24 divisors (see below), whose sum is σ = 168860160. Its totient is φ = 43189200.

The previous prime is 91421983. The next prime is 91422011. The reversal of 91421996 is 69912419.

It is a happy number.

It is a Smith number, since the sum of its digits (41) 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 7 ways as a sum of consecutive naturals, for example, 31361 + ... + 34151.

It is an arithmetic number, because the mean of its divisors is an integer number (7035840).

Almost surely, 2^91421996 is an apocalyptic number.

It is an amenable number.

91421996 is a deficient number, since it is larger than the sum of its proper divisors (77438164).

91421996 is a wasteful number, since it uses less digits than its factorization.

91421996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3245 (or 3243 counting only the distinct ones).

The product of its digits is 34992, while the sum is 41.

The square root of 91421996 is about 9561.4850311026. The cubic root of 91421996 is about 450.4883521399.

The spelling of 91421996 in words is "ninety-one million, four hundred twenty-one thousand, nine hundred ninety-six".