197161649 has 2 divisors, whose sum is σ = 197161650. Its totient is φ = 197161648.

The previous prime is 197161639. The next prime is 197161721. The reversal of 197161649 is 946161791.

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., 135303424 + 61858225 = 11632^2 + 7865^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197161649 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (197161619) 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, 98580824 + 98580825.

It is an arithmetic number, because the mean of its divisors is an integer number (98580825).

Almost surely, 2^197161649 is an apocalyptic number.

It is an amenable number.

197161649 is a deficient number, since it is larger than the sum of its proper divisors (1).

197161649 is an equidigital number, since it uses as much as digits as its factorization.

197161649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 44.

The square root of 197161649 is about 14041.4261740038. The cubic root of 197161649 is about 582.0238935960.

The spelling of 197161649 in words is "one hundred ninety-seven million, one hundred sixty-one thousand, six hundred forty-nine".