197284891 has 2 divisors, whose sum is σ = 197284892. Its totient is φ = 197284890.

The previous prime is 197284873. The next prime is 197284933. The reversal of 197284891 is 198482791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 197284891 - 2¹⁵ = 197252123 is a prime.

It is not a weakly prime, because it can be changed into another prime (197224891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98642445 + 98642446.

It is an arithmetic number, because the mean of its divisors is an integer number (98642446).

Almost surely, 2^197284891 is an apocalyptic number.

197284891 is a deficient number, since it is larger than the sum of its proper divisors (1).

197284891 is an equidigital number, since it uses as much as digits as its factorization.

197284891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 49.

The square root of 197284891 is about 14045.8140027554. The cubic root of 197284891 is about 582.1451390285.

The spelling of 197284891 in words is "one hundred ninety-seven million, two hundred eighty-four thousand, eight hundred ninety-one".