81137154 has 64 divisors (see below), whose sum is σ = 190771200. Its totient is φ = 22528128.

The previous prime is 81137153. The next prime is 81137159. The reversal of 81137154 is 45173118.

It is not an unprimeable number, because it can be changed into a prime (81137153) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 339367 + ... + 339605.

It is an arithmetic number, because the mean of its divisors is an integer number (2980800).

Almost surely, 2^81137154 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81137154, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95385600).

81137154 is an abundant number, since it is smaller than the sum of its proper divisors (109634046).

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

81137154 is a wasteful number, since it uses less digits than its factorization.

81137154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447.

The product of its digits is 3360, while the sum is 30.

The square root of 81137154 is about 9007.6164438768. The cubic root of 81137154 is about 432.9189436286.

The spelling of 81137154 in words is "eighty-one million, one hundred thirty-seven thousand, one hundred fifty-four".