81873059 has 2 divisors, whose sum is σ = 81873060. Its totient is φ = 81873058.

The previous prime is 81873053. The next prime is 81873067. The reversal of 81873059 is 95037818.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81873059 - 2⁸ = 81872803 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (81873053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40936529 + 40936530.

It is an arithmetic number, because the mean of its divisors is an integer number (40936530).

Almost surely, 2^81873059 is an apocalyptic number.

81873059 is a deficient number, since it is larger than the sum of its proper divisors (1).

81873059 is an equidigital number, since it uses as much as digits as its factorization.

81873059 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 81873059 is about 9048.3732792143. The cubic root of 81873059 is about 434.2238487188.

The spelling of 81873059 in words is "eighty-one million, eight hundred seventy-three thousand, fifty-nine".