2311538213 has 2 divisors, whose sum is σ = 2311538214. Its totient is φ = 2311538212.

The previous prime is 2311538191. The next prime is 2311538239. The reversal of 2311538213 is 3128351132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2244674884 + 66863329 = 47378^2 + 8177^2 .

It is a cyclic number.

It is not a de Polignac number, because 2311538213 - 2²⁰ = 2310489637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2311538113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1155769106 + 1155769107.

It is an arithmetic number, because the mean of its divisors is an integer number (1155769107).

Almost surely, 2^2311538213 is an apocalyptic number.

It is an amenable number.

2311538213 is a deficient number, since it is larger than the sum of its proper divisors (1).

2311538213 is an equidigital number, since it uses as much as digits as its factorization.

2311538213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 2311538213 is about 48078.4589291296. The cubic root of 2311538213 is about 1322.2097615067.

Adding to 2311538213 its reverse (3128351132), we get a palindrome (5439889345).

The spelling of 2311538213 in words is "two billion, three hundred eleven million, five hundred thirty-eight thousand, two hundred thirteen".