998307257 has 2 divisors, whose sum is σ = 998307258. Its totient is φ = 998307256.

The previous prime is 998307187. The next prime is 998307263. The reversal of 998307257 is 752703899.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 691216681 + 307090576 = 26291^2 + 17524^2 .

It is an emirp because it is prime and its reverse (752703899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 998307257 - 2⁸ = 998307001 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (998304257) 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, 499153628 + 499153629.

It is an arithmetic number, because the mean of its divisors is an integer number (499153629).

Almost surely, 2^998307257 is an apocalyptic number.

It is an amenable number.

998307257 is a deficient number, since it is larger than the sum of its proper divisors (1).

998307257 is an equidigital number, since it uses as much as digits as its factorization.

998307257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 952560, while the sum is 50.

The square root of 998307257 is about 31596.0006488163. Note that the first 3 decimals coincide. The cubic root of 998307257 is about 999.4354336582.

The spelling of 998307257 in words is "nine hundred ninety-eight million, three hundred seven thousand, two hundred fifty-seven".