2131330261 has 2 divisors, whose sum is σ = 2131330262. Its totient is φ = 2131330260.

The previous prime is 2131330249. The next prime is 2131330343. The reversal of 2131330261 is 1620331312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2126962161 + 4368100 = 46119^2 + 2090^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131330261 - 2⁷ = 2131330133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2131330231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065665130 + 1065665131.

It is an arithmetic number, because the mean of its divisors is an integer number (1065665131).

Almost surely, 2^2131330261 is an apocalyptic number.

It is an amenable number.

2131330261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131330261 is an equidigital number, since it uses as much as digits as its factorization.

2131330261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 2131330261 is about 46166.3325487308. The cubic root of 2131330261 is about 1286.9161480832.

Adding to 2131330261 its reverse (1620331312), we get a palindrome (3751661573).

The spelling of 2131330261 in words is "two billion, one hundred thirty-one million, three hundred thirty thousand, two hundred sixty-one".