981815459 has 2 divisors, whose sum is σ = 981815460. Its totient is φ = 981815458.

The previous prime is 981815453. The next prime is 981815489. The reversal of 981815459 is 954518189.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 981815459 - 2⁸ = 981815203 is a prime.

It is not a weakly prime, because it can be changed into another prime (981815453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490907729 + 490907730.

It is an arithmetic number, because the mean of its divisors is an integer number (490907730).

Almost surely, 2^981815459 is an apocalyptic number.

981815459 is a deficient number, since it is larger than the sum of its proper divisors (1).

981815459 is an equidigital number, since it uses as much as digits as its factorization.

981815459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 50.

The square root of 981815459 is about 31333.9346236632. The cubic root of 981815459 is about 993.9013686383.

The spelling of 981815459 in words is "nine hundred eighty-one million, eight hundred fifteen thousand, four hundred fifty-nine".