2131331161 has 2 divisors, whose sum is σ = 2131331162. Its totient is φ = 2131331160.

The previous prime is 2131331143. The next prime is 2131331203. The reversal of 2131331161 is 1611331312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2068430400 + 62900761 = 45480^2 + 7931^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131331161 - 2²³ = 2122942553 is a prime.

It is not a weakly prime, because it can be changed into another prime (2131331101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065665580 + 1065665581.

It is an arithmetic number, because the mean of its divisors is an integer number (1065665581).

Almost surely, 2^2131331161 is an apocalyptic number.

It is an amenable number.

2131331161 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131331161 is an equidigital number, since it uses as much as digits as its factorization.

2131331161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 22.

The square root of 2131331161 is about 46166.3422960927. The cubic root of 2131331161 is about 1286.9163292259.

Adding to 2131331161 its reverse (1611331312), we get a palindrome (3742662473).

The spelling of 2131331161 in words is "two billion, one hundred thirty-one million, three hundred thirty-one thousand, one hundred sixty-one".