197049989 has 2 divisors, whose sum is σ = 197049990. Its totient is φ = 197049988.

The previous prime is 197049961. The next prime is 197049997. The reversal of 197049989 is 989940791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119028100 + 78021889 = 10910^2 + 8833^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197049989 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 (197049929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98524994 + 98524995.

It is an arithmetic number, because the mean of its divisors is an integer number (98524995).

Almost surely, 2^197049989 is an apocalyptic number.

It is an amenable number.

197049989 is a deficient number, since it is larger than the sum of its proper divisors (1).

197049989 is an equidigital number, since it uses as much as digits as its factorization.

197049989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 56.

The square root of 197049989 is about 14037.4495190544. The cubic root of 197049989 is about 581.9139988967.

The spelling of 197049989 in words is "one hundred ninety-seven million, forty-nine thousand, nine hundred eighty-nine".