43531261 has 4 divisors (see below), whose sum is σ = 45822400. Its totient is φ = 41240124.

The previous prime is 43531231. The next prime is 43531273. The reversal of 43531261 is 16213534.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16213534 = 2 ⋅8106767.

It is a cyclic number.

It is not a de Polignac number, because 43531261 - 2¹⁵ = 43498493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43531231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1145541 + ... + 1145578.

It is an arithmetic number, because the mean of its divisors is an integer number (11455600).

Almost surely, 2^43531261 is an apocalyptic number.

It is an amenable number.

43531261 is a deficient number, since it is larger than the sum of its proper divisors (2291139).

43531261 is a wasteful number, since it uses less digits than its factorization.

43531261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2291138.

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

The square root of 43531261 is about 6597.8224438067. The cubic root of 43531261 is about 351.7767098198.

Adding to 43531261 its reverse (16213534), we get a palindrome (59744795).

The spelling of 43531261 in words is "forty-three million, five hundred thirty-one thousand, two hundred sixty-one".