91489389 has 16 divisors (see below), whose sum is σ = 129031680. Its totient is φ = 57501360.

The previous prime is 91489381. The next prime is 91489417. The reversal of 91489389 is 98398419.

It is a happy number.

It is not a de Polignac number, because 91489389 - 2³ = 91489381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91489381) 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, 8224 + ... + 15830.

It is an arithmetic number, because the mean of its divisors is an integer number (8064480).

Almost surely, 2^91489389 is an apocalyptic number.

It is an amenable number.

91489389 is a deficient number, since it is larger than the sum of its proper divisors (37542291).

91489389 is a wasteful number, since it uses less digits than its factorization.

91489389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7840.

The product of its digits is 559872, while the sum is 51.

The square root of 91489389 is about 9565.0085729183. The cubic root of 91489389 is about 450.5990195426.

The spelling of 91489389 in words is "ninety-one million, four hundred eighty-nine thousand, three hundred eighty-nine".