81439154 has 8 divisors (see below), whose sum is σ = 122707200. Its totient is φ = 40536756.

The previous prime is 81439123. The next prime is 81439181. The reversal of 81439154 is 45193418.

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

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, 90854 + ... + 91745.

It is an arithmetic number, because the mean of its divisors is an integer number (15338400).

Almost surely, 2^81439154 is an apocalyptic number.

81439154 is a deficient number, since it is larger than the sum of its proper divisors (41268046).

81439154 is a wasteful number, since it uses less digits than its factorization.

81439154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182824.

The product of its digits is 17280, while the sum is 35.

The square root of 81439154 is about 9024.3644651576. The cubic root of 81439154 is about 433.4554000625.

The spelling of 81439154 in words is "eighty-one million, four hundred thirty-nine thousand, one hundred fifty-four".