91406889 has 12 divisors (see below), whose sum is σ = 150894016. Its totient is φ = 52232472.

The previous prime is 91406839. The next prime is 91406893. The reversal of 91406889 is 98860419.

It is not a de Polignac number, because 91406889 - 2¹⁶ = 91341353 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91406839) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 725389 + ... + 725514.

Almost surely, 2^91406889 is an apocalyptic number.

It is an amenable number.

91406889 is a deficient number, since it is larger than the sum of its proper divisors (59487127).

91406889 is a wasteful number, since it uses less digits than its factorization.

91406889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1450916 (or 1450913 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 91406889 is about 9560.6950061175. The cubic root of 91406889 is about 450.4635371693.

The spelling of 91406889 in words is "ninety-one million, four hundred six thousand, eight hundred eighty-nine".