81159132 has 12 divisors (see below), whose sum is σ = 189371336. Its totient is φ = 27053040.

The previous prime is 81159101. The next prime is 81159151. The reversal of 81159132 is 23195118.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 81159132.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3381619 + ... + 3381642.

Almost surely, 2^81159132 is an apocalyptic number.

It is an amenable number.

81159132 is an abundant number, since it is smaller than the sum of its proper divisors (108212204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81159132 is a wasteful number, since it uses less digits than its factorization.

81159132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6763268 (or 6763266 counting only the distinct ones).

The product of its digits is 2160, while the sum is 30.

The square root of 81159132 is about 9008.8363288496. The cubic root of 81159132 is about 432.9580290254.

The spelling of 81159132 in words is "eighty-one million, one hundred fifty-nine thousand, one hundred thirty-two".