971966861 has 2 divisors, whose sum is σ = 971966862. Its totient is φ = 971966860.

The previous prime is 971966851. The next prime is 971966899. The reversal of 971966861 is 168669179.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 925984900 + 45981961 = 30430^2 + 6781^2 .

It is a cyclic number.

It is not a de Polignac number, because 971966861 - 2¹⁴ = 971950477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (971966851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485983430 + 485983431.

It is an arithmetic number, because the mean of its divisors is an integer number (485983431).

Almost surely, 2^971966861 is an apocalyptic number.

It is an amenable number.

971966861 is a deficient number, since it is larger than the sum of its proper divisors (1).

971966861 is an equidigital number, since it uses as much as digits as its factorization.

971966861 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 971966861 is about 31176.3830647495. The cubic root of 971966861 is about 990.5669170747.

The spelling of 971966861 in words is "nine hundred seventy-one million, nine hundred sixty-six thousand, eight hundred sixty-one".