5661812 has 12 divisors (see below), whose sum is σ = 10670436. Its totient is φ = 2613120.

The previous prime is 5661811. The next prime is 5661823. The reversal of 5661812 is 2181665.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2298256 + 3363556 = 1516^2 + 1834^2 .

It is a super-2 number, since 2×5661812² = 64112230246688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54389 + ... + 54492.

It is an arithmetic number, because the mean of its divisors is an integer number (889203).

Almost surely, 2^5661812 is an apocalyptic number.

5661812 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

5661812 is a deficient number, since it is larger than the sum of its proper divisors (5008624).

5661812 is a wasteful number, since it uses less digits than its factorization.

5661812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108898 (or 108896 counting only the distinct ones).

The product of its digits is 2880, while the sum is 29.

The square root of 5661812 is about 2379.4562404045. The cubic root of 5661812 is about 178.2317815473.

The spelling of 5661812 in words is "five million, six hundred sixty-one thousand, eight hundred twelve".