81676799 has 2 divisors, whose sum is σ = 81676800. Its totient is φ = 81676798.

The previous prime is 81676783. The next prime is 81676807. The reversal of 81676799 is 99767618.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81676799 - 2⁴ = 81676783 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 81676799.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81676729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40838399 + 40838400.

It is an arithmetic number, because the mean of its divisors is an integer number (40838400).

Almost surely, 2^81676799 is an apocalyptic number.

81676799 is a deficient number, since it is larger than the sum of its proper divisors (1).

81676799 is an equidigital number, since it uses as much as digits as its factorization.

81676799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 53.

The square root of 81676799 is about 9037.5217288812. The cubic root of 81676799 is about 433.8766080864.

The spelling of 81676799 in words is "eighty-one million, six hundred seventy-six thousand, seven hundred ninety-nine".