91768651 has 16 divisors (see below), whose sum is σ = 104608000. Its totient is φ = 79805088.

The previous prime is 91768639. The next prime is 91768679. The reversal of 91768651 is 15686719.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 91768651 - 2¹⁵ = 91735883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91768598 and 91768607.

It is not an unprimeable number, because it can be changed into a prime (91768631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48220 + ... + 50086.

It is an arithmetic number, because the mean of its divisors is an integer number (6538000).

Almost surely, 2^91768651 is an apocalyptic number.

91768651 is a deficient number, since it is larger than the sum of its proper divisors (12839349).

91768651 is a wasteful number, since it uses less digits than its factorization.

91768651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2098.

The product of its digits is 90720, while the sum is 43.

The square root of 91768651 is about 9579.5955551370. The cubic root of 91768651 is about 451.0570229913.

The spelling of 91768651 in words is "ninety-one million, seven hundred sixty-eight thousand, six hundred fifty-one".