989898197 has 2 divisors, whose sum is σ = 989898198. Its totient is φ = 989898196.

The previous prime is 989898163. The next prime is 989898241. The reversal of 989898197 is 791898989.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 588256516 + 401641681 = 24254^2 + 20041^2 .

It is a cyclic number.

It is not a de Polignac number, because 989898197 - 2⁸ = 989897941 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989898997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494949098 + 494949099.

It is an arithmetic number, because the mean of its divisors is an integer number (494949099).

Almost surely, 2^989898197 is an apocalyptic number.

It is an amenable number.

989898197 is a deficient number, since it is larger than the sum of its proper divisors (1).

989898197 is an equidigital number, since it uses as much as digits as its factorization.

989898197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23514624, while the sum is 68.

The square root of 989898197 is about 31462.6476476472. The cubic root of 989898197 is about 996.6213297772.

The spelling of 989898197 in words is "nine hundred eighty-nine million, eight hundred ninety-eight thousand, one hundred ninety-seven".