1210971161 has 2 divisors, whose sum is σ = 1210971162. Its totient is φ = 1210971160.

The previous prime is 1210971131. The next prime is 1210971163. The reversal of 1210971161 is 1611790121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 768121225 + 442849936 = 27715^2 + 21044^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1210971161 is a prime.

It is a Sophie Germain prime.

Together with 1210971163, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1210971163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605485580 + 605485581.

It is an arithmetic number, because the mean of its divisors is an integer number (605485581).

Almost surely, 2^1210971161 is an apocalyptic number.

It is an amenable number.

1210971161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210971161 is an equidigital number, since it uses as much as digits as its factorization.

1210971161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 29.

The square root of 1210971161 is about 34799.0109198523. The cubic root of 1210971161 is about 1065.8872490505.

The spelling of 1210971161 in words is "one billion, two hundred ten million, nine hundred seventy-one thousand, one hundred sixty-one".