81341399 has 2 divisors, whose sum is σ = 81341400. Its totient is φ = 81341398.

The previous prime is 81341389. The next prime is 81341419. The reversal of 81341399 is 99314318.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81341399 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 (81341329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40670699 + 40670700.

It is an arithmetic number, because the mean of its divisors is an integer number (40670700).

Almost surely, 2^81341399 is an apocalyptic number.

81341399 is a deficient number, since it is larger than the sum of its proper divisors (1).

81341399 is an equidigital number, since it uses as much as digits as its factorization.

81341399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The square root of 81341399 is about 9018.9466679873. The cubic root of 81341399 is about 433.2818987604.

The spelling of 81341399 in words is "eighty-one million, three hundred forty-one thousand, three hundred ninety-nine".