5811836561 has 2 divisors, whose sum is σ = 5811836562. Its totient is φ = 5811836560.

The previous prime is 5811836501. The next prime is 5811836567. The reversal of 5811836561 is 1656381185.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5543695936 + 268140625 = 74456^2 + 16375^2 .

It is a cyclic number.

It is not a de Polignac number, because 5811836561 - 2¹⁰ = 5811835537 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (5811836567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2905918280 + 2905918281.

It is an arithmetic number, because the mean of its divisors is an integer number (2905918281).

Almost surely, 2^5811836561 is an apocalyptic number.

It is an amenable number.

5811836561 is a deficient number, since it is larger than the sum of its proper divisors (1).

5811836561 is an equidigital number, since it uses as much as digits as its factorization.

5811836561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172800, while the sum is 44.

The square root of 5811836561 is about 76235.4022813548. The cubic root of 5811836561 is about 1797.9231768217.

The spelling of 5811836561 in words is "five billion, eight hundred eleven million, eight hundred thirty-six thousand, five hundred sixty-one".