43311681 has 48 divisors (see below), whose sum is σ = 75132928. Its totient is φ = 23522400.

The previous prime is 43311679. The next prime is 43311701. The reversal of 43311681 is 18611334.

It is not a de Polignac number, because 43311681 - 2¹ = 43311679 is a prime.

It is a super-2 number, since 2×43311681² = 3751803422091522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43311661) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 130686 + ... + 131016.

Almost surely, 2^43311681 is an apocalyptic number.

It is an amenable number.

43311681 is a deficient number, since it is larger than the sum of its proper divisors (31821247).

43311681 is a wasteful number, since it uses less digits than its factorization.

43311681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442 (or 439 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 43311681 is about 6581.1610677752. The cubic root of 43311681 is about 351.1842361988.

The spelling of 43311681 in words is "forty-three million, three hundred eleven thousand, six hundred eighty-one".