81501159 has 8 divisors (see below), whose sum is σ = 108767232. Its totient is φ = 54284600.

The previous prime is 81501143. The next prime is 81501169. The reversal of 81501159 is 95110518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81501159 - 2⁴ = 81501143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81501169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8349 + ... + 15254.

It is an arithmetic number, because the mean of its divisors is an integer number (13595904).

Almost surely, 2^81501159 is an apocalyptic number.

81501159 is a deficient number, since it is larger than the sum of its proper divisors (27266073).

81501159 is a wasteful number, since it uses less digits than its factorization.

81501159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24757.

The product of its (nonzero) digits is 1800, while the sum is 30.

The square root of 81501159 is about 9027.7992334788. The cubic root of 81501159 is about 433.5653782189.

The spelling of 81501159 in words is "eighty-one million, five hundred one thousand, one hundred fifty-nine".