197686961 has 2 divisors, whose sum is σ = 197686962. Its totient is φ = 197686960.

The previous prime is 197686919. The next prime is 197687011. The reversal of 197686961 is 169686791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117852736 + 79834225 = 10856^2 + 8935^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197686961 is a prime.

It is not a weakly prime, because it can be changed into another prime (197686261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98843480 + 98843481.

It is an arithmetic number, because the mean of its divisors is an integer number (98843481).

Almost surely, 2^197686961 is an apocalyptic number.

It is an amenable number.

197686961 is a deficient number, since it is larger than the sum of its proper divisors (1).

197686961 is an equidigital number, since it uses as much as digits as its factorization.

197686961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 53.

The square root of 197686961 is about 14060.1195229628. The cubic root of 197686961 is about 582.5403446056.

The spelling of 197686961 in words is "one hundred ninety-seven million, six hundred eighty-six thousand, nine hundred sixty-one".