261565443 has 12 divisors (see below), whose sum is σ = 391810328. Its totient is φ = 174376800.

The previous prime is 261565433. The next prime is 261565537. The reversal of 261565443 is 344565162.

261565443 is a `hidden beast` number, since 2 + 61 + 56 + 544 + 3 = 666.

261565443 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261565443 - 2⁹ = 261564931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261565398 and 261565407.

It is not an unprimeable number, because it can be changed into a prime (261565433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 537958 + ... + 538443.

Almost surely, 2^261565443 is an apocalyptic number.

261565443 is a deficient number, since it is larger than the sum of its proper divisors (130244885).

261565443 is an equidigital number, since it uses as much as digits as its factorization.

261565443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076416 (or 1076404 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 261565443 is about 16172.9849749513. The cubic root of 261565443 is about 639.5288223050.

The spelling of 261565443 in words is "two hundred sixty-one million, five hundred sixty-five thousand, four hundred forty-three".