81054881 has 8 divisors (see below), whose sum is σ = 82137600. Its totient is φ = 79976160.

The previous prime is 81054859. The next prime is 81054887. The reversal of 81054881 is 18845018.

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

It is a cyclic number.

It is not a de Polignac number, because 81054881 - 2¹⁴ = 81038497 is a prime.

It is a super-2 number, since 2×81054881² = 13139787467848322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81054887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81296 + ... + 82286.

It is an arithmetic number, because the mean of its divisors is an integer number (10267200).

Almost surely, 2^81054881 is an apocalyptic number.

It is an amenable number.

81054881 is a deficient number, since it is larger than the sum of its proper divisors (1082719).

81054881 is an equidigital number, since it uses as much as digits as its factorization.

81054881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999.

The product of its (nonzero) digits is 10240, while the sum is 35.

The square root of 81054881 is about 9003.0484281714. The cubic root of 81054881 is about 432.7725676713.

Adding to 81054881 its reverse (18845018), we get a palindrome (99899899).

The spelling of 81054881 in words is "eighty-one million, fifty-four thousand, eight hundred eighty-one".