196568921 has 2 divisors, whose sum is σ = 196568922. Its totient is φ = 196568920.

The previous prime is 196568917. The next prime is 196568941. The reversal of 196568921 is 129865691.

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., 123654400 + 72914521 = 11120^2 + 8539^2 .

It is an emirp because it is prime and its reverse (129865691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 196568921 - 2² = 196568917 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (196568941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98284460 + 98284461.

It is an arithmetic number, because the mean of its divisors is an integer number (98284461).

Almost surely, 2^196568921 is an apocalyptic number.

It is an amenable number.

196568921 is a deficient number, since it is larger than the sum of its proper divisors (1).

196568921 is an equidigital number, since it uses as much as digits as its factorization.

196568921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 47.

The square root of 196568921 is about 14020.3038840105. The cubic root of 196568921 is about 581.4400610816.

The spelling of 196568921 in words is "one hundred ninety-six million, five hundred sixty-eight thousand, nine hundred twenty-one".