81839054 has 32 divisors (see below), whose sum is σ = 142995456. Its totient is φ = 34715520.

The previous prime is 81839047. The next prime is 81839081. The reversal of 81839054 is 45093818.

It is a super-2 number, since 2×81839054² = 13395261519229832, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81838999 and 81839017.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46637 + ... + 48359.

It is an arithmetic number, because the mean of its divisors is an integer number (4468608).

Almost surely, 2^81839054 is an apocalyptic number.

81839054 is a deficient number, since it is larger than the sum of its proper divisors (61156402).

81839054 is a wasteful number, since it uses less digits than its factorization.

81839054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1880.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 81839054 is about 9046.4940170212. The cubic root of 81839054 is about 434.1637238259.

The spelling of 81839054 in words is "eighty-one million, eight hundred thirty-nine thousand, fifty-four".