81417799 has 2 divisors, whose sum is σ = 81417800. Its totient is φ = 81417798.

The previous prime is 81417767. The next prime is 81417803. The reversal of 81417799 is 99771418.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81417799 - 2⁵ = 81417767 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 (81417719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40708899 + 40708900.

It is an arithmetic number, because the mean of its divisors is an integer number (40708900).

Almost surely, 2^81417799 is an apocalyptic number.

81417799 is a deficient number, since it is larger than the sum of its proper divisors (1).

81417799 is an equidigital number, since it uses as much as digits as its factorization.

81417799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 46.

The square root of 81417799 is about 9023.1812017714. The cubic root of 81417799 is about 433.4175098144.

The spelling of 81417799 in words is "eighty-one million, four hundred seventeen thousand, seven hundred ninety-nine".