81159054 has 32 divisors (see below), whose sum is σ = 177417216. Its totient is φ = 24639360.

The previous prime is 81159031. The next prime is 81159077. The reversal of 81159054 is 45095118.

It is an interprime number because it is at equal distance from previous prime (81159031) and next prime (81159077).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9672 + ... + 15995.

It is an arithmetic number, because the mean of its divisors is an integer number (5544288).

Almost surely, 2^81159054 is an apocalyptic number.

81159054 is an abundant number, since it is smaller than the sum of its proper divisors (96258162).

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

81159054 is a wasteful number, since it uses less digits than its factorization.

81159054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25720.

The product of its (nonzero) digits is 7200, while the sum is 33.

The square root of 81159054 is about 9008.8319997656. The cubic root of 81159054 is about 432.9578903236.

The spelling of 81159054 in words is "eighty-one million, one hundred fifty-nine thousand, fifty-four".