998537 has 2 divisors, whose sum is σ = 998538. Its totient is φ = 998536.

The previous prime is 998527. The next prime is 998539. The reversal of 998537 is 735899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 942841 + 55696 = 971^2 + 236^2 .

It is a cyclic number.

It is not a de Polignac number, because 998537 - 2⁸ = 998281 is a prime.

It is a super-2 number, since 2×998537² = 1994152280738, which contains 22 as substring.

Together with 998539, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 998494 and 998503.

It is not a weakly prime, because it can be changed into another prime (998539) 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, 499268 + 499269.

It is an arithmetic number, because the mean of its divisors is an integer number (499269).

2⁹⁹⁸⁵³⁷ is an apocalyptic number.

It is an amenable number.

998537 is a deficient number, since it is larger than the sum of its proper divisors (1).

998537 is an equidigital number, since it uses as much as digits as its factorization.

998537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 41.

The square root of 998537 is about 999.2682322580. The cubic root of 998537 is about 99.9512095321.

The spelling of 998537 in words is "nine hundred ninety-eight thousand, five hundred thirty-seven".