197221291 has 2 divisors, whose sum is σ = 197221292. Its totient is φ = 197221290.

The previous prime is 197221289. The next prime is 197221303. The reversal of 197221291 is 192122791.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 197221291 - 2¹ = 197221289 is a prime.

Together with 197221289, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (197221261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98610645 + 98610646.

It is an arithmetic number, because the mean of its divisors is an integer number (98610646).

Almost surely, 2^197221291 is an apocalyptic number.

197221291 is a deficient number, since it is larger than the sum of its proper divisors (1).

197221291 is an equidigital number, since it uses as much as digits as its factorization.

197221291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 34.

The square root of 197221291 is about 14043.5498005312. The cubic root of 197221291 is about 582.0825756800.

The spelling of 197221291 in words is "one hundred ninety-seven million, two hundred twenty-one thousand, two hundred ninety-one".