91788851 has 16 divisors (see below), whose sum is σ = 114835968. Its totient is φ = 71275200.

The previous prime is 91788847. The next prime is 91788859. The reversal of 91788851 is 15888719.

It is a cyclic number.

It is not a de Polignac number, because 91788851 - 2² = 91788847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91788796 and 91788805.

It is not an unprimeable number, because it can be changed into a prime (91788859) 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, 22031 + ... + 25863.

It is an arithmetic number, because the mean of its divisors is an integer number (7177248).

Almost surely, 2^91788851 is an apocalyptic number.

91788851 is a deficient number, since it is larger than the sum of its proper divisors (23047117).

91788851 is a wasteful number, since it uses less digits than its factorization.

91788851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4162.

The product of its digits is 161280, while the sum is 47.

The square root of 91788851 is about 9580.6498213848. The cubic root of 91788851 is about 451.0901159314.

The spelling of 91788851 in words is "ninety-one million, seven hundred eighty-eight thousand, eight hundred fifty-one".