81883813 has 8 divisors (see below), whose sum is σ = 89397216. Its totient is φ = 74382000.

The previous prime is 81883793. The next prime is 81883843. The reversal of 81883813 is 31838818.

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

It is not a de Polignac number, because 81883813 - 2²⁵ = 48329381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81883843) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 19338 + ... + 23188.

It is an arithmetic number, because the mean of its divisors is an integer number (11174652).

Almost surely, 2^81883813 is an apocalyptic number.

It is an amenable number.

81883813 is a deficient number, since it is larger than the sum of its proper divisors (7513403).

81883813 is a wasteful number, since it uses less digits than its factorization.

81883813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5795.

The product of its digits is 36864, while the sum is 40.

The square root of 81883813 is about 9048.9675101638. The cubic root of 81883813 is about 434.2428596075.

The spelling of 81883813 in words is "eighty-one million, eight hundred eighty-three thousand, eight hundred thirteen".