91863689 has 8 divisors (see below), whose sum is σ = 97556640. Its totient is φ = 86256576.

The previous prime is 91863659. The next prime is 91863697. The reversal of 91863689 is 98636819.

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 91863689 - 2¹⁶ = 91798153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91863659) 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, 19247 + ... + 23540.

It is an arithmetic number, because the mean of its divisors is an integer number (12194580).

Almost surely, 2^91863689 is an apocalyptic number.

It is an amenable number.

91863689 is a deficient number, since it is larger than the sum of its proper divisors (5692951).

91863689 is a wasteful number, since it uses less digits than its factorization.

91863689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42919.

The product of its digits is 559872, while the sum is 50.

The square root of 91863689 is about 9584.5547105747. The cubic root of 91863689 is about 451.2126780621.

The spelling of 91863689 in words is "ninety-one million, eight hundred sixty-three thousand, six hundred eighty-nine".