5661131 has 4 divisors (see below), whose sum is σ = 6469872. Its totient is φ = 4852392.

The previous prime is 5661121. The next prime is 5661143. The reversal of 5661131 is 1311665.

It is a happy number.

5661131 is digitally balanced in base 8, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 5661131 - 2⁶ = 5661067 is a prime.

It is a super-2 number, since 2×5661131² = 64096808398322, which contains 22 as substring.

It is a Duffinian number.

5661131 is strictly pandigital in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 5661097 and 5661106.

It is not an unprimeable number, because it can be changed into a prime (5661121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404360 + ... + 404373.

It is an arithmetic number, because the mean of its divisors is an integer number (1617468).

Almost surely, 2^5661131 is an apocalyptic number.

5661131 is a deficient number, since it is larger than the sum of its proper divisors (808741).

5661131 is an equidigital number, since it uses as much as digits as its factorization.

5661131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808740.

The product of its digits is 540, while the sum is 23.

The square root of 5661131 is about 2379.3131361803. The cubic root of 5661131 is about 178.2246353834.

Adding to 5661131 its reverse (1311665), we get a palindrome (6972796).

It can be divided in two parts, 566 and 1131, that multiplied together give a triangular number (640146 = T₁₁₃₁).

The spelling of 5661131 in words is "five million, six hundred sixty-one thousand, one hundred thirty-one".