197649901 has 2 divisors, whose sum is σ = 197649902. Its totient is φ = 197649900.

The previous prime is 197649883. The next prime is 197649919. The reversal of 197649901 is 109946791.

It is a balanced prime because it is at equal distance from previous prime (197649883) and next prime (197649919).

It can be written as a sum of positive squares in only one way, i.e., 126585001 + 71064900 = 11251^2 + 8430^2 .

It is an emirp because it is prime and its reverse (109946791) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197649901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197649961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98824950 + 98824951.

It is an arithmetic number, because the mean of its divisors is an integer number (98824951).

Almost surely, 2^197649901 is an apocalyptic number.

It is an amenable number.

197649901 is a deficient number, since it is larger than the sum of its proper divisors (1).

197649901 is an equidigital number, since it uses as much as digits as its factorization.

197649901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 197649901 is about 14058.8015492075. The cubic root of 197649901 is about 582.5039397524.

The spelling of 197649901 in words is "one hundred ninety-seven million, six hundred forty-nine thousand, nine hundred one".