80781893 has 2 divisors, whose sum is σ = 80781894. Its totient is φ = 80781892.

The previous prime is 80781881. The next prime is 80781917. The reversal of 80781893 is 39818708.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80586529 + 195364 = 8977^2 + 442^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80781893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80781803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40390946 + 40390947.

It is an arithmetic number, because the mean of its divisors is an integer number (40390947).

Almost surely, 2^80781893 is an apocalyptic number.

It is an amenable number.

80781893 is a deficient number, since it is larger than the sum of its proper divisors (1).

80781893 is an equidigital number, since it uses as much as digits as its factorization.

80781893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 80781893 is about 8987.8747766088. The cubic root of 80781893 is about 432.2861704863.

The spelling of 80781893 in words is "eighty million, seven hundred eighty-one thousand, eight hundred ninety-three".