5561811 has 8 divisors (see below), whose sum is σ = 8239760. Its totient is φ = 3707856.

The previous prime is 5561779. The next prime is 5561819. The reversal of 5561811 is 1181655.

It is not a de Polignac number, because 5561811 - 2⁵ = 5561779 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 205993 = 5561811 / (5 + 5 + 6 + 1 + 8 + 1 + 1).

It is a Duffinian number.

5561811 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (5561819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102970 + ... + 103023.

It is an arithmetic number, because the mean of its divisors is an integer number (1029970).

Almost surely, 2^5561811 is an apocalyptic number.

5561811 is a deficient number, since it is larger than the sum of its proper divisors (2677949).

5561811 is a wasteful number, since it uses less digits than its factorization.

5561811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206002 (or 205996 counting only the distinct ones).

The product of its digits is 1200, while the sum is 27.

The square root of 5561811 is about 2358.3492107828. The cubic root of 5561811 is about 177.1762106130.

The spelling of 5561811 in words is "five million, five hundred sixty-one thousand, eight hundred eleven".