43661443131 has 6 divisors (see below), whose sum is σ = 63066528980. Its totient is φ = 29107628748.

The previous prime is 43661443123. The next prime is 43661443159. The reversal of 43661443131 is 13134416634.

43661443131 is a `hidden beast` number, since 4 + 3 + 6 + 614 + 4 + 3 + 1 + 31 = 666.

It is not a de Polignac number, because 43661443131 - 2³ = 43661443123 is a prime.

It is a super-2 number, since 2×43661443131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43661443121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2425635721 + ... + 2425635738.

Almost surely, 2^43661443131 is an apocalyptic number.

43661443131 is a deficient number, since it is larger than the sum of its proper divisors (19405085849).

43661443131 is a wasteful number, since it uses less digits than its factorization.

43661443131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4851271465 (or 4851271462 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

Adding to 43661443131 its reverse (13134416634), we get a palindrome (56795859765).

The spelling of 43661443131 in words is "forty-three billion, six hundred sixty-one million, four hundred forty-three thousand, one hundred thirty-one".