81057883 has 4 divisors (see below), whose sum is σ = 82034568. Its totient is φ = 80081200.

The previous prime is 81057869. The next prime is 81057913. The reversal of 81057883 is 38875018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81057883 - 2¹³ = 81049691 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81057803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 488218 + ... + 488383.

It is an arithmetic number, because the mean of its divisors is an integer number (20508642).

Almost surely, 2^81057883 is an apocalyptic number.

81057883 is a gapful number since it is divisible by the number (83) formed by its first and last digit.

81057883 is a deficient number, since it is larger than the sum of its proper divisors (976685).

81057883 is an equidigital number, since it uses as much as digits as its factorization.

81057883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976684.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 81057883 is about 9003.2151479347. The cubic root of 81057883 is about 432.7779104185. Note that the first 3 decimals are identical.

The spelling of 81057883 in words is "eighty-one million, fifty-seven thousand, eight hundred eighty-three".