5656321213 has 2 divisors, whose sum is σ = 5656321214. Its totient is φ = 5656321212.

The previous prime is 5656321171. The next prime is 5656321241. The reversal of 5656321213 is 3121236565.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4086022084 + 1570299129 = 63922^2 + 39627^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5656321213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5656321273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2828160606 + 2828160607.

It is an arithmetic number, because the mean of its divisors is an integer number (2828160607).

Almost surely, 2^5656321213 is an apocalyptic number.

It is an amenable number.

5656321213 is a deficient number, since it is larger than the sum of its proper divisors (1).

5656321213 is an equidigital number, since it uses as much as digits as its factorization.

5656321213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 34.

The square root of 5656321213 is about 75208.5182210100. The cubic root of 5656321213 is about 1781.7414691980.

Adding to 5656321213 its reverse (3121236565), we get a palindrome (8777557778).

The spelling of 5656321213 in words is "five billion, six hundred fifty-six million, three hundred twenty-one thousand, two hundred thirteen".