81226811 has 2 divisors, whose sum is σ = 81226812. Its totient is φ = 81226810.

The previous prime is 81226759. The next prime is 81226837. The reversal of 81226811 is 11862218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81226811 - 2²⁶ = 14117947 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81226841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40613405 + 40613406.

It is an arithmetic number, because the mean of its divisors is an integer number (40613406).

Almost surely, 2^81226811 is an apocalyptic number.

81226811 is a deficient number, since it is larger than the sum of its proper divisors (1).

81226811 is an equidigital number, since it uses as much as digits as its factorization.

81226811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536, while the sum is 29.

The square root of 81226811 is about 9012.5918025838. The cubic root of 81226811 is about 433.0783441989.

The spelling of 81226811 in words is "eighty-one million, two hundred twenty-six thousand, eight hundred eleven".