81158154 has 64 divisors (see below), whose sum is σ = 204567552. Its totient is φ = 20851200.

The previous prime is 81158149. The next prime is 81158171. The reversal of 81158154 is 45185118.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43909 + ... + 45719.

It is an arithmetic number, because the mean of its divisors is an integer number (3196368).

Almost surely, 2^81158154 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81158154, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102283776).

81158154 is an abundant number, since it is smaller than the sum of its proper divisors (123409398).

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

81158154 is a wasteful number, since it uses less digits than its factorization.

81158154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1931.

The product of its digits is 6400, while the sum is 33.

The square root of 81158154 is about 9008.7820486456. The cubic root of 81158154 is about 432.9562899126.

The spelling of 81158154 in words is "eighty-one million, one hundred fifty-eight thousand, one hundred fifty-four".