81800683 has 2 divisors, whose sum is σ = 81800684. Its totient is φ = 81800682.

The previous prime is 81800671. The next prime is 81800687. The reversal of 81800683 is 38600818.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81800683 is a prime.

It is not a weakly prime, because it can be changed into another prime (81800687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40900341 + 40900342.

It is an arithmetic number, because the mean of its divisors is an integer number (40900342).

Almost surely, 2^81800683 is an apocalyptic number.

81800683 is a deficient number, since it is larger than the sum of its proper divisors (1).

81800683 is an equidigital number, since it uses as much as digits as its factorization.

81800683 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 81800683 is about 9044.3730020383. The cubic root of 81800683 is about 434.0958593214.

The spelling of 81800683 in words is "eighty-one million, eight hundred thousand, six hundred eighty-three".