81541194 has 48 divisors (see below), whose sum is σ = 190502208. Its totient is φ = 23200128.

The previous prime is 81541181. The next prime is 81541237. The reversal of 81541194 is 49114518.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 98667 + ... + 99489.

It is an arithmetic number, because the mean of its divisors is an integer number (3968796).

Almost surely, 2^81541194 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81541194, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95251104).

81541194 is an abundant number, since it is smaller than the sum of its proper divisors (108961014).

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

81541194 is a wasteful number, since it uses less digits than its factorization.

81541194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1179 (or 1172 counting only the distinct ones).

The product of its digits is 5760, while the sum is 33.

The square root of 81541194 is about 9030.0162790551. The cubic root of 81541194 is about 433.6363585940.

The spelling of 81541194 in words is "eighty-one million, five hundred forty-one thousand, one hundred ninety-four".