81360911 has 2 divisors, whose sum is σ = 81360912. Its totient is φ = 81360910.

The previous prime is 81360893. The next prime is 81360919. The reversal of 81360911 is 11906318.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81360911 - 2²⁶ = 14252047 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 (81360919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40680455 + 40680456.

It is an arithmetic number, because the mean of its divisors is an integer number (40680456).

Almost surely, 2^81360911 is an apocalyptic number.

81360911 is a deficient number, since it is larger than the sum of its proper divisors (1).

81360911 is an equidigital number, since it uses as much as digits as its factorization.

81360911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 81360911 is about 9020.0283258979. The cubic root of 81360911 is about 433.3165409009.

The spelling of 81360911 in words is "eighty-one million, three hundred sixty thousand, nine hundred eleven".