998503631 has 2 divisors, whose sum is σ = 998503632. Its totient is φ = 998503630.

The previous prime is 998503621. The next prime is 998503633. The reversal of 998503631 is 136305899.

It is a strong prime.

It is an emirp because it is prime and its reverse (136305899) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998503631 is a prime.

It is a super-2 number, since 2×998503631² = 1994019002240368322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 998503633, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_50775488 and since 998503631 and 50775488 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998503633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499251815 + 499251816.

It is an arithmetic number, because the mean of its divisors is an integer number (499251816).

Almost surely, 2^998503631 is an apocalyptic number.

998503631 is a deficient number, since it is larger than the sum of its proper divisors (1).

998503631 is an equidigital number, since it uses as much as digits as its factorization.

998503631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 174960, while the sum is 44.

The square root of 998503631 is about 31599.1080728555. The cubic root of 998503631 is about 999.5009613352.

The spelling of 998503631 in words is "nine hundred ninety-eight million, five hundred three thousand, six hundred thirty-one".