5661131231 has 16 divisors (see below), whose sum is σ = 6574310400. Its totient is φ = 4774487328.

The previous prime is 5661131227. The next prime is 5661131251. The reversal of 5661131231 is 1321311665.

It is a cyclic number.

It is not a de Polignac number, because 5661131231 - 2² = 5661131227 is a prime.

It is a super-2 number, since 2×5661131231² = 64096813629207150722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 5661131194 and 5661131203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661131221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144560 + ... + 179498.

It is an arithmetic number, because the mean of its divisors is an integer number (410894400).

Almost surely, 2^5661131231 is an apocalyptic number.

5661131231 is a deficient number, since it is larger than the sum of its proper divisors (913179169).

5661131231 is a wasteful number, since it uses less digits than its factorization.

5661131231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35318.

The product of its digits is 3240, while the sum is 29.

The square root of 5661131231 is about 75240.4893059581. The cubic root of 5661131231 is about 1782.2463780751.

Adding to 5661131231 its reverse (1321311665), we get a palindrome (6982442896).

The spelling of 5661131231 in words is "five billion, six hundred sixty-one million, one hundred thirty-one thousand, two hundred thirty-one".