197222065409 has 2 divisors, whose sum is σ = 197222065410. Its totient is φ = 197222065408.

The previous prime is 197222065387. The next prime is 197222065421. The reversal of 197222065409 is 904560222791.

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., 180155255809 + 17066809600 = 424447^2 + 130640^2 .

It is an emirp because it is prime and its reverse (904560222791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197222065409 - 2¹⁶ = 197221999873 is a prime.

It is not a weakly prime, because it can be changed into another prime (197222065459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98611032704 + 98611032705.

It is an arithmetic number, because the mean of its divisors is an integer number (98611032705).

Almost surely, 2^197222065409 is an apocalyptic number.

It is an amenable number.

197222065409 is a deficient number, since it is larger than the sum of its proper divisors (1).

197222065409 is an equidigital number, since it uses as much as digits as its factorization.

197222065409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 197222065409 in words is "one hundred ninety-seven billion, two hundred twenty-two million, sixty-five thousand, four hundred nine".