91887489 has 6 divisors (see below), whose sum is σ = 132726386. Its totient is φ = 61258320.

The previous prime is 91887487. The next prime is 91887527. The reversal of 91887489 is 98478819.

It can be written as a sum of positive squares in only one way, i.e., 91527489 + 360000 = 9567^2 + 600^2 .

It is not a de Polignac number, because 91887489 - 2¹ = 91887487 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91887487) 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 5 ways as a sum of consecutive naturals, for example, 5104852 + ... + 5104869.

Almost surely, 2^91887489 is an apocalyptic number.

It is an amenable number.

91887489 is a deficient number, since it is larger than the sum of its proper divisors (40838897).

91887489 is a wasteful number, since it uses less digits than its factorization.

91887489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10209727 (or 10209724 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The square root of 91887489 is about 9585.7962110614. The cubic root of 91887489 is about 451.2516413514.

The spelling of 91887489 in words is "ninety-one million, eight hundred eighty-seven thousand, four hundred eighty-nine".