998813 has 2 divisors, whose sum is σ = 998814. Its totient is φ = 998812.

The previous prime is 998779. The next prime is 998819. The reversal of 998813 is 318899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 996004 + 2809 = 998^2 + 53^2 .

It is a cyclic number.

It is not a de Polignac number, because 998813 - 2⁶ = 998749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499406 + 499407.

It is an arithmetic number, because the mean of its divisors is an integer number (499407).

2⁹⁹⁸⁸¹³ is an apocalyptic number.

It is an amenable number.

998813 is a deficient number, since it is larger than the sum of its proper divisors (1).

998813 is an equidigital number, since it uses as much as digits as its factorization.

998813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 38.

The square root of 998813 is about 999.4063237743. The cubic root of 998813 is about 99.9604176678.

It can be divided in two parts, 9988 and 13, that added together give a palindrome (10001).

The spelling of 998813 in words is "nine hundred ninety-eight thousand, eight hundred thirteen".