197137643 has 2 divisors, whose sum is σ = 197137644. Its totient is φ = 197137642.

The previous prime is 197137639. The next prime is 197137691. The reversal of 197137643 is 346731791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 197137643 - 2² = 197137639 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 197137643.

It is not a weakly prime, because it can be changed into another prime (197137043) 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, 98568821 + 98568822.

It is an arithmetic number, because the mean of its divisors is an integer number (98568822).

Almost surely, 2^197137643 is an apocalyptic number.

197137643 is a deficient number, since it is larger than the sum of its proper divisors (1).

197137643 is an equidigital number, since it uses as much as digits as its factorization.

197137643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 41.

The square root of 197137643 is about 14040.5713202847. The cubic root of 197137643 is about 582.0002706234. Note that the first 3 decimals are identical.

The spelling of 197137643 in words is "one hundred ninety-seven million, one hundred thirty-seven thousand, six hundred forty-three".