998227897 has 2 divisors, whose sum is σ = 998227898. Its totient is φ = 998227896.

The previous prime is 998227817. The next prime is 998227933. The reversal of 998227897 is 798722899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 994708521 + 3519376 = 31539^2 + 1876^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998227897 is a prime.

It is not a weakly prime, because it can be changed into another prime (998227817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499113948 + 499113949.

It is an arithmetic number, because the mean of its divisors is an integer number (499113949).

Almost surely, 2^998227897 is an apocalyptic number.

It is an amenable number.

998227897 is a deficient number, since it is larger than the sum of its proper divisors (1).

998227897 is an equidigital number, since it uses as much as digits as its factorization.

998227897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9144576, while the sum is 61.

The square root of 998227897 is about 31594.7447687111. The cubic root of 998227897 is about 999.4089497284.

The spelling of 998227897 in words is "nine hundred ninety-eight million, two hundred twenty-seven thousand, eight hundred ninety-seven".