91681456 has 20 divisors (see below), whose sum is σ = 178210072. Its totient is φ = 45691776.

The previous prime is 91681439. The next prime is 91681463. The reversal of 91681456 is 65418619.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4146 + ... + 14161.

Almost surely, 2^91681456 is an apocalyptic number.

It is an amenable number.

91681456 is a deficient number, since it is larger than the sum of its proper divisors (86528616).

91681456 is a wasteful number, since it uses less digits than its factorization.

91681456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18628 (or 18622 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The square root of 91681456 is about 9575.0433941575. The cubic root of 91681456 is about 450.9141187793.

The spelling of 91681456 in words is "ninety-one million, six hundred eighty-one thousand, four hundred fifty-six".