998311 has 2 divisors, whose sum is σ = 998312. Its totient is φ = 998310.

The previous prime is 998287. The next prime is 998329. The reversal of 998311 is 113899.

It is a strong prime.

It is an emirp because it is prime and its reverse (113899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 998311 - 2¹¹ = 996263 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499155 + 499156.

It is an arithmetic number, because the mean of its divisors is an integer number (499156).

2⁹⁹⁸³¹¹ is an apocalyptic number.

998311 is a deficient number, since it is larger than the sum of its proper divisors (1).

998311 is an equidigital number, since it uses as much as digits as its factorization.

998311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 31.

The square root of 998311 is about 999.1551431084. The cubic root of 998311 is about 99.9436682733.

The spelling of 998311 in words is "nine hundred ninety-eight thousand, three hundred eleven".