43491761 has 6 divisors (see below), whose sum is σ = 44700390. Its totient is φ = 42314976.

The previous prime is 43491757. The next prime is 43491787. The reversal of 43491761 is 16719434.

43491761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 19088161 + 24403600 = 4369^2 + 4940^2 .

It is not a de Polignac number, because 43491761 - 2² = 43491757 is a prime.

It is a super-2 number, since 2×43491761² = 3783066549762242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43491731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14516 + ... + 17253.

It is an arithmetic number, because the mean of its divisors is an integer number (7450065).

Almost surely, 2^43491761 is an apocalyptic number.

It is an amenable number.

43491761 is a deficient number, since it is larger than the sum of its proper divisors (1208629).

43491761 is an equidigital number, since it uses as much as digits as its factorization.

43491761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31843 (or 31806 counting only the distinct ones).

The product of its digits is 18144, while the sum is 35.

The square root of 43491761 is about 6594.8283525805. The cubic root of 43491761 is about 351.6702776097.

The spelling of 43491761 in words is "forty-three million, four hundred ninety-one thousand, seven hundred sixty-one".