197488909 has 2 divisors, whose sum is σ = 197488910. Its totient is φ = 197488908.

The previous prime is 197488901. The next prime is 197488931. The reversal of 197488909 is 909884791.

197488909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152893225 + 44595684 = 12365^2 + 6678^2 .

It is a cyclic number.

It is not a de Polignac number, because 197488909 - 2³ = 197488901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 197488909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197488901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98744454 + 98744455.

It is an arithmetic number, because the mean of its divisors is an integer number (98744455).

Almost surely, 2^197488909 is an apocalyptic number.

It is an amenable number.

197488909 is a deficient number, since it is larger than the sum of its proper divisors (1).

197488909 is an equidigital number, since it uses as much as digits as its factorization.

197488909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1306368, while the sum is 55.

The square root of 197488909 is about 14053.0747169436. The cubic root of 197488909 is about 582.3457409252.

The spelling of 197488909 in words is "one hundred ninety-seven million, four hundred eighty-eight thousand, nine hundred nine".