5811340981 has 2 divisors, whose sum is σ = 5811340982. Its totient is φ = 5811340980.

The previous prime is 5811340963. The next prime is 5811340993. The reversal of 5811340981 is 1890431185.

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., 3579628900 + 2231712081 = 59830^2 + 47241^2 .

It is a cyclic number.

It is not a de Polignac number, because 5811340981 - 2²⁷ = 5677123253 is a prime.

It is a super-2 number, since 2×5811340981² = 67543367994900084722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5811340901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2905670490 + 2905670491.

It is an arithmetic number, because the mean of its divisors is an integer number (2905670491).

Almost surely, 2^5811340981 is an apocalyptic number.

It is an amenable number.

5811340981 is a deficient number, since it is larger than the sum of its proper divisors (1).

5811340981 is an equidigital number, since it uses as much as digits as its factorization.

5811340981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 40.

The square root of 5811340981 is about 76232.1518848838. The cubic root of 5811340981 is about 1797.8720719151.

The spelling of 5811340981 in words is "five billion, eight hundred eleven million, three hundred forty thousand, nine hundred eighty-one".