998943431 has 2 divisors, whose sum is σ = 998943432. Its totient is φ = 998943430.

The previous prime is 998943403. The next prime is 998943437. The reversal of 998943431 is 134349899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998943431 - 2¹⁴ = 998927047 is a prime.

It is a super-2 number, since 2×998943431² = 1995775956676103522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 998943431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998943437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499471715 + 499471716.

It is an arithmetic number, because the mean of its divisors is an integer number (499471716).

Almost surely, 2^998943431 is an apocalyptic number.

998943431 is a deficient number, since it is larger than the sum of its proper divisors (1).

998943431 is an equidigital number, since it uses as much as digits as its factorization.

998943431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 50.

The square root of 998943431 is about 31606.0663639118. The cubic root of 998943431 is about 999.6476862229.

The spelling of 998943431 in words is "nine hundred ninety-eight million, nine hundred forty-three thousand, four hundred thirty-one".