998539 has 2 divisors, whose sum is σ = 998540. Its totient is φ = 998538.

The previous prime is 998537. The next prime is 998551. The reversal of 998539 is 935899.

It is a weak prime.

It is an emirp because it is prime and its reverse (935899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 998539 - 2¹ = 998537 is a prime.

It is a super-3 number, since 3×998539³ = 2986870201333394457, which contains 333 as substring.

Together with 998537, it forms a pair of twin primes.

998539 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 998495 and 998504.

It is not a weakly prime, because it can be changed into another prime (998537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499269 + 499270.

It is an arithmetic number, because the mean of its divisors is an integer number (499270).

2⁹⁹⁸⁵³⁹ is an apocalyptic number.

998539 is a deficient number, since it is larger than the sum of its proper divisors (1).

998539 is an equidigital number, since it uses as much as digits as its factorization.

998539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87480, while the sum is 43.

The square root of 998539 is about 999.2692329898. The cubic root of 998539 is about 99.9512762638.

The spelling of 998539 in words is "nine hundred ninety-eight thousand, five hundred thirty-nine".