197686057 has 2 divisors, whose sum is σ = 197686058. Its totient is φ = 197686056.

The previous prime is 197686043. The next prime is 197686067. The reversal of 197686057 is 750686791.

197686057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197571136 + 114921 = 14056^2 + 339^2 .

It is an emirp because it is prime and its reverse (750686791) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197686057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 197686057.

It is not a weakly prime, because it can be changed into another prime (197686037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98843028 + 98843029.

It is an arithmetic number, because the mean of its divisors is an integer number (98843029).

Almost surely, 2^197686057 is an apocalyptic number.

It is an amenable number.

197686057 is a deficient number, since it is larger than the sum of its proper divisors (1).

197686057 is an equidigital number, since it uses as much as digits as its factorization.

197686057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 49.

The square root of 197686057 is about 14060.0873752619. The cubic root of 197686057 is about 582.5394566407.

The spelling of 197686057 in words is "one hundred ninety-seven million, six hundred eighty-six thousand, fifty-seven".