5661081 has 6 divisors (see below), whose sum is σ = 8177130. Its totient is φ = 3774048.

The previous prime is 5661067. The next prime is 5661083. The reversal of 5661081 is 1801665.

It can be written as a sum of positive squares in only one way, i.e., 4995225 + 665856 = 2235^2 + 816^2 .

It is not a de Polignac number, because 5661081 - 2²¹ = 3563929 is a prime.

It is a super-2 number, since 2×5661081² = 64095676177122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5661083) 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 5 ways as a sum of consecutive naturals, for example, 314496 + ... + 314513.

It is an arithmetic number, because the mean of its divisors is an integer number (1362855).

Almost surely, 2^5661081 is an apocalyptic number.

It is an amenable number.

5661081 is a deficient number, since it is larger than the sum of its proper divisors (2516049).

5661081 is a wasteful number, since it uses less digits than its factorization.

5661081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629015 (or 629012 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 5661081 is about 2379.3026289230. The cubic root of 5661081 is about 178.2241106792.

Subtracting from 5661081 its product of nonzero digits (1440), we obtain a square (5659641 = 2379²).

The spelling of 5661081 in words is "five million, six hundred sixty-one thousand, eighty-one".