971931161 has 2 divisors, whose sum is σ = 971931162. Its totient is φ = 971931160.

The previous prime is 971931067. The next prime is 971931167. The reversal of 971931161 is 161139179.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 622801936 + 349129225 = 24956^2 + 18685^2 .

It is a cyclic number.

It is not a de Polignac number, because 971931161 - 2²² = 967736857 is a prime.

It is not a weakly prime, because it can be changed into another prime (971931167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485965580 + 485965581.

It is an arithmetic number, because the mean of its divisors is an integer number (485965581).

Almost surely, 2^971931161 is an apocalyptic number.

It is an amenable number.

971931161 is a deficient number, since it is larger than the sum of its proper divisors (1).

971931161 is an equidigital number, since it uses as much as digits as its factorization.

971931161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10206, while the sum is 38.

The square root of 971931161 is about 31175.8105107149. The cubic root of 971931161 is about 990.5547892017.

The spelling of 971931161 in words is "nine hundred seventy-one million, nine hundred thirty-one thousand, one hundred sixty-one".