981599 has 2 divisors, whose sum is σ = 981600. Its totient is φ = 981598.

The previous prime is 981587. The next prime is 981601. The reversal of 981599 is 995189.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981599 is a prime.

Together with 981601, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490799 + 490800.

It is an arithmetic number, because the mean of its divisors is an integer number (490800).

2⁹⁸¹⁵⁹⁹ is an apocalyptic number.

981599 is a deficient number, since it is larger than the sum of its proper divisors (1).

981599 is an equidigital number, since it uses as much as digits as its factorization.

981599 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 41.

The square root of 981599 is about 990.7567814555. The cubic root of 981599 is about 99.3828322084.

The spelling of 981599 in words is "nine hundred eighty-one thousand, five hundred ninety-nine".