998933251 has 2 divisors, whose sum is σ = 998933252. Its totient is φ = 998933250.

The previous prime is 998933239. The next prime is 998933267. The reversal of 998933251 is 152339899.

It is a weak prime.

It is an emirp because it is prime and its reverse (152339899) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998933251 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 998933195 and 998933204.

It is not a weakly prime, because it can be changed into another prime (998933231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499466625 + 499466626.

It is an arithmetic number, because the mean of its divisors is an integer number (499466626).

Almost surely, 2^998933251 is an apocalyptic number.

998933251 is a deficient number, since it is larger than the sum of its proper divisors (1).

998933251 is an equidigital number, since it uses as much as digits as its factorization.

998933251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 524880, while the sum is 49.

The square root of 998933251 is about 31605.9053184686. The cubic root of 998933251 is about 999.6442904857.

The spelling of 998933251 in words is "nine hundred ninety-eight million, nine hundred thirty-three thousand, two hundred fifty-one".