81487959 has 16 divisors (see below), whose sum is σ = 124446720. Its totient is φ = 46461600.

The previous prime is 81487957. The next prime is 81487963. The reversal of 81487959 is 95978418.

It is not a de Polignac number, because 81487959 - 2¹ = 81487957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81487957) 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, 6009 + ... + 14109.

It is an arithmetic number, because the mean of its divisors is an integer number (7777920).

Almost surely, 2^81487959 is an apocalyptic number.

81487959 is a deficient number, since it is larger than the sum of its proper divisors (42958761).

81487959 is a wasteful number, since it uses less digits than its factorization.

81487959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8590.

The product of its digits is 725760, while the sum is 51.

The square root of 81487959 is about 9027.0681286894. The cubic root of 81487959 is about 433.5419700774.

The spelling of 81487959 in words is "eighty-one million, four hundred eighty-seven thousand, nine hundred fifty-nine".