81451842 has 8 divisors (see below), whose sum is σ = 162903696. Its totient is φ = 27150612.

The previous prime is 81451829. The next prime is 81451873. The reversal of 81451842 is 24815418.

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

81451842 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6787648 + ... + 6787659.

It is an arithmetic number, because the mean of its divisors is an integer number (20362962).

Almost surely, 2^81451842 is an apocalyptic number.

81451842 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81451842 is a wasteful number, since it uses less digits than its factorization.

81451842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13575312.

The product of its digits is 10240, while the sum is 33.

The square root of 81451842 is about 9025.0674235709. The cubic root of 81451842 is about 433.4779092867.

The spelling of 81451842 in words is "eighty-one million, four hundred fifty-one thousand, eight hundred forty-two".