81045499 has 2 divisors, whose sum is σ = 81045500. Its totient is φ = 81045498.

The previous prime is 81045487. The next prime is 81045529. The reversal of 81045499 is 99454018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81045499 - 2¹¹ = 81043451 is a prime.

It is a nialpdrome in base 14.

It is not a weakly prime, because it can be changed into another prime (81045199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40522749 + 40522750.

It is an arithmetic number, because the mean of its divisors is an integer number (40522750).

Almost surely, 2^81045499 is an apocalyptic number.

81045499 is a deficient number, since it is larger than the sum of its proper divisors (1).

81045499 is an equidigital number, since it uses as much as digits as its factorization.

81045499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 81045499 is about 9002.5273673563. The cubic root of 81045499 is about 432.7558694012.

The spelling of 81045499 in words is "eighty-one million, forty-five thousand, four hundred ninety-nine".