5611991893 has 2 divisors, whose sum is σ = 5611991894. Its totient is φ = 5611991892.

The previous prime is 5611991857. The next prime is 5611991897. The reversal of 5611991893 is 3981991165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3431382084 + 2180609809 = 58578^2 + 46697^2 .

It is a cyclic number.

It is not a de Polignac number, because 5611991893 - 2⁹ = 5611991381 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5611991893.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5611991897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2805995946 + 2805995947.

It is an arithmetic number, because the mean of its divisors is an integer number (2805995947).

Almost surely, 2^5611991893 is an apocalyptic number.

It is an amenable number.

5611991893 is a deficient number, since it is larger than the sum of its proper divisors (1).

5611991893 is an equidigital number, since it uses as much as digits as its factorization.

5611991893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 52.

The square root of 5611991893 is about 74913.2290920636. The cubic root of 5611991893 is about 1777.0746771145.

The spelling of 5611991893 in words is "five billion, six hundred eleven million, nine hundred ninety-one thousand, eight hundred ninety-three".