197568121 has 2 divisors, whose sum is σ = 197568122. Its totient is φ = 197568120.

The previous prime is 197568073. The next prime is 197568127. The reversal of 197568121 is 121865791.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159264400 + 38303721 = 12620^2 + 6189^2 .

It is a cyclic number.

It is not a de Polignac number, because 197568121 - 2⁹ = 197567609 is a prime.

It is not a weakly prime, because it can be changed into another prime (197568127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98784060 + 98784061.

It is an arithmetic number, because the mean of its divisors is an integer number (98784061).

Almost surely, 2^197568121 is an apocalyptic number.

It is an amenable number.

197568121 is a deficient number, since it is larger than the sum of its proper divisors (1).

197568121 is an equidigital number, since it uses as much as digits as its factorization.

197568121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 40.

The square root of 197568121 is about 14055.8927500177. The cubic root of 197568121 is about 582.4235893557.

The spelling of 197568121 in words is "one hundred ninety-seven million, five hundred sixty-eight thousand, one hundred twenty-one".