43531381 has 8 divisors (see below), whose sum is σ = 44765784. Its totient is φ = 42305280.

The previous prime is 43531361. The next prime is 43531403. The reversal of 43531381 is 18313534.

43531381 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 4 ways, for example, as 2044900 + 41486481 = 1430^2 + 6441^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 43531381 - 2⁹ = 43530869 is a prime.

It is a super-2 number, since 2×43531381² = 3789962263534322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43531361) 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 7 ways as a sum of consecutive naturals, for example, 9441 + ... + 13273.

It is an arithmetic number, because the mean of its divisors is an integer number (5595723).

Almost surely, 2^43531381 is an apocalyptic number.

43531381 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

43531381 is a deficient number, since it is larger than the sum of its proper divisors (1234403).

43531381 is a wasteful number, since it uses less digits than its factorization.

43531381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4151.

The product of its digits is 4320, while the sum is 28.

The square root of 43531381 is about 6597.8315377099. The cubic root of 43531381 is about 351.7770330601. Note that the first 3 decimals are identical.

The spelling of 43531381 in words is "forty-three million, five hundred thirty-one thousand, three hundred eighty-one".