197875409 has 2 divisors, whose sum is σ = 197875410. Its totient is φ = 197875408.

The previous prime is 197875361. The next prime is 197875459. The reversal of 197875409 is 904578791.

It is an a-pointer prime, because the next prime (197875459) can be obtained adding 197875409 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149989009 + 47886400 = 12247^2 + 6920^2 .

It is a cyclic number.

It is not a de Polignac number, because 197875409 - 2¹⁶ = 197809873 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (197875459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98937704 + 98937705.

It is an arithmetic number, because the mean of its divisors is an integer number (98937705).

Almost surely, 2^197875409 is an apocalyptic number.

It is an amenable number.

197875409 is a deficient number, since it is larger than the sum of its proper divisors (1).

197875409 is an equidigital number, since it uses as much as digits as its factorization.

197875409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 50.

The square root of 197875409 is about 14066.8194343995. The cubic root of 197875409 is about 582.7253908661.

The spelling of 197875409 in words is "one hundred ninety-seven million, eight hundred seventy-five thousand, four hundred nine".