43521361 has 8 divisors (see below), whose sum is σ = 48136424. Its totient is φ = 39087360.

The previous prime is 43521353. The next prime is 43521383. The reversal of 43521361 is 16312534.

It can be written as a sum of positive squares in 4 ways, for example, as 1336336 + 42185025 = 1156^2 + 6495^2 .

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

It is not a de Polignac number, because 43521361 - 2³ = 43521353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43521301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44760 + ... + 45721.

It is an arithmetic number, because the mean of its divisors is an integer number (6017053).

Almost surely, 2^43521361 is an apocalyptic number.

It is an amenable number.

43521361 is a deficient number, since it is larger than the sum of its proper divisors (4615063).

43521361 is a wasteful number, since it uses less digits than its factorization.

43521361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90531.

The product of its digits is 2160, while the sum is 25.

The square root of 43521361 is about 6597.0721536148. The cubic root of 43521361 is about 351.7500404533.

Adding to 43521361 its reverse (16312534), we get a palindrome (59833895).

The spelling of 43521361 in words is "forty-three million, five hundred twenty-one thousand, three hundred sixty-one".