91489851 has 16 divisors (see below), whose sum is σ = 136141600. Its totient is φ = 60722784.

The previous prime is 91489847. The next prime is 91489873. The reversal of 91489851 is 15898419.

91489851 is a `hidden beast` number, since 91 + 489 + 85 + 1 = 666.

It is not a de Polignac number, because 91489851 - 2² = 91489847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91489797 and 91489806.

It is not an unprimeable number, because it can be changed into a prime (91489831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1216 + ... + 13581.

It is an arithmetic number, because the mean of its divisors is an integer number (8508850).

Almost surely, 2^91489851 is an apocalyptic number.

91489851 is a deficient number, since it is larger than the sum of its proper divisors (44651749).

91489851 is a wasteful number, since it uses less digits than its factorization.

91489851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15035 (or 15029 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 91489851 is about 9565.0327234150. The cubic root of 91489851 is about 450.5997780145.

The spelling of 91489851 in words is "ninety-one million, four hundred eighty-nine thousand, eight hundred fifty-one".