65531889 has 16 divisors (see below), whose sum is σ = 102795840. Its totient is φ = 41117760.

The previous prime is 65531849. The next prime is 65531911. The reversal of 65531889 is 98813556.

65531889 is a `hidden beast` number, since 6 + 553 + 18 + 89 = 666.

It is not a de Polignac number, because 65531889 - 2⁸ = 65531633 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65531849) 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, 70927 + ... + 71844.

It is an arithmetic number, because the mean of its divisors is an integer number (6424740).

Almost surely, 2^65531889 is an apocalyptic number.

It is an amenable number.

65531889 is a deficient number, since it is larger than the sum of its proper divisors (37263951).

65531889 is a wasteful number, since it uses less digits than its factorization.

65531889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142797 (or 142791 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 65531889 is about 8095.1768973877. The cubic root of 65531889 is about 403.1663055566.

The spelling of 65531889 in words is "sixty-five million, five hundred thirty-one thousand, eight hundred eighty-nine".