81059299 has 2 divisors, whose sum is σ = 81059300. Its totient is φ = 81059298.

The previous prime is 81059287. The next prime is 81059353. The reversal of 81059299 is 99295018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81059299 - 2¹⁵ = 81026531 is a prime.

It is not a weakly prime, because it can be changed into another prime (81059239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40529649 + 40529650.

It is an arithmetic number, because the mean of its divisors is an integer number (40529650).

Almost surely, 2^81059299 is an apocalyptic number.

81059299 is a deficient number, since it is larger than the sum of its proper divisors (1).

81059299 is an equidigital number, since it uses as much as digits as its factorization.

81059299 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 43.

The square root of 81059299 is about 9003.2937861651. The cubic root of 81059299 is about 432.7804304693.

The spelling of 81059299 in words is "eighty-one million, fifty-nine thousand, two hundred ninety-nine".