5661811 has 2 divisors, whose sum is σ = 5661812. Its totient is φ = 5661810.

The previous prime is 5661797. The next prime is 5661823. The reversal of 5661811 is 1181665.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5661811 - 2⁵ = 5661779 is a prime.

It is a super-3 number, since 3×5661811³ (a number of 21 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 5661811.

It is not a weakly prime, because it can be changed into another prime (5661311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2830905 + 2830906.

It is an arithmetic number, because the mean of its divisors is an integer number (2830906).

Almost surely, 2^5661811 is an apocalyptic number.

5661811 is a deficient number, since it is larger than the sum of its proper divisors (1).

5661811 is an equidigital number, since it uses as much as digits as its factorization.

5661811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 28.

The square root of 5661811 is about 2379.4560302725. The cubic root of 5661811 is about 178.2317710541.

The spelling of 5661811 in words is "five million, six hundred sixty-one thousand, eight hundred eleven".