81286411 has 2 divisors, whose sum is σ = 81286412. Its totient is φ = 81286410.

The previous prime is 81286397. The next prime is 81286421. The reversal of 81286411 is 11468218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81286411 - 2¹⁵ = 81253643 is a prime.

It is a super-2 number, since 2×81286411² = 13214961226521842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81286421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40643205 + 40643206.

It is an arithmetic number, because the mean of its divisors is an integer number (40643206).

Almost surely, 2^81286411 is an apocalyptic number.

81286411 is a deficient number, since it is larger than the sum of its proper divisors (1).

81286411 is an equidigital number, since it uses as much as digits as its factorization.

81286411 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3072, while the sum is 31.

The square root of 81286411 is about 9015.8976813183. The cubic root of 81286411 is about 433.1842417407.

The spelling of 81286411 in words is "eighty-one million, two hundred eighty-six thousand, four hundred eleven".