2561188213 has 2 divisors, whose sum is σ = 2561188214. Its totient is φ = 2561188212.

The previous prime is 2561188141. The next prime is 2561188243. The reversal of 2561188213 is 3128811652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2420836804 + 140351409 = 49202^2 + 11847^2 .

It is a cyclic number.

It is not a de Polignac number, because 2561188213 - 2¹³ = 2561180021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2561188243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280594106 + 1280594107.

It is an arithmetic number, because the mean of its divisors is an integer number (1280594107).

Almost surely, 2^2561188213 is an apocalyptic number.

It is an amenable number.

2561188213 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561188213 is an equidigital number, since it uses as much as digits as its factorization.

2561188213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 37.

The square root of 2561188213 is about 50608.1832612079. The cubic root of 2561188213 is about 1368.1923720682.

Adding to 2561188213 its reverse (3128811652), we get a palindrome (5689999865).

The spelling of 2561188213 in words is "two billion, five hundred sixty-one million, one hundred eighty-eight thousand, two hundred thirteen".