81702811 has 2 divisors, whose sum is σ = 81702812. Its totient is φ = 81702810.

The previous prime is 81702781. The next prime is 81702821. The reversal of 81702811 is 11820718.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81702811 - 2⁷ = 81702683 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81702811.

It is not a weakly prime, because it can be changed into another prime (81702821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40851405 + 40851406.

It is an arithmetic number, because the mean of its divisors is an integer number (40851406).

Almost surely, 2^81702811 is an apocalyptic number.

81702811 is a deficient number, since it is larger than the sum of its proper divisors (1).

81702811 is an equidigital number, since it uses as much as digits as its factorization.

81702811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 28.

The square root of 81702811 is about 9038.9607256587. The cubic root of 81702811 is about 433.9226627824.

The spelling of 81702811 in words is "eighty-one million, seven hundred two thousand, eight hundred eleven".