2164411261 has 2 divisors, whose sum is σ = 2164411262. Its totient is φ = 2164411260.

The previous prime is 2164411187. The next prime is 2164411267. The reversal of 2164411261 is 1621144612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2133885636 + 30525625 = 46194^2 + 5525^2 .

It is a cyclic number.

It is not a de Polignac number, because 2164411261 - 2²³ = 2156022653 is a prime.

It is a super-2 number, since 2×2164411261² = 9369352213487220242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2164411267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082205630 + 1082205631.

It is an arithmetic number, because the mean of its divisors is an integer number (1082205631).

Almost surely, 2^2164411261 is an apocalyptic number.

It is an amenable number.

2164411261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2164411261 is an equidigital number, since it uses as much as digits as its factorization.

2164411261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 28.

The square root of 2164411261 is about 46523.2335613078. The cubic root of 2164411261 is about 1293.5401947006.

Adding to 2164411261 its reverse (1621144612), we get a palindrome (3785555873).

The spelling of 2164411261 in words is "two billion, one hundred sixty-four million, four hundred eleven thousand, two hundred sixty-one".