1971680897 has 2 divisors, whose sum is σ = 1971680898. Its totient is φ = 1971680896.

The previous prime is 1971680873. The next prime is 1971680903. The reversal of 1971680897 is 7980861791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 997991281 + 973689616 = 31591^2 + 31204^2 .

It is a cyclic number.

It is not a de Polignac number, because 1971680897 - 2²² = 1967486593 is a prime.

It is not a weakly prime, because it can be changed into another prime (1971683897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985840448 + 985840449.

It is an arithmetic number, because the mean of its divisors is an integer number (985840449).

Almost surely, 2^1971680897 is an apocalyptic number.

It is an amenable number.

1971680897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1971680897 is an equidigital number, since it uses as much as digits as its factorization.

1971680897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1524096, while the sum is 56.

The square root of 1971680897 is about 44403.6135579076. The cubic root of 1971680897 is about 1253.9461207558.

The spelling of 1971680897 in words is "one billion, nine hundred seventy-one million, six hundred eighty thousand, eight hundred ninety-seven".