261443 has 16 divisors (see below), whose sum is σ = 342720. Its totient is φ = 194688.

The previous prime is 261439. The next prime is 261451. The reversal of 261443 is 344162.

It is a happy number.

It is not a de Polignac number, because 261443 - 2² = 261439 is a prime.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (261433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15371 + ... + 15387.

It is an arithmetic number, because the mean of its divisors is an integer number (21420).

2²⁶¹⁴⁴³ is an apocalyptic number.

261443 is a deficient number, since it is larger than the sum of its proper divisors (81277).

261443 is an equidigital number, since it uses as much as digits as its factorization.

261443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63 (or 37 counting only the distinct ones).

The product of its digits is 576, while the sum is 20.

The square root of 261443 is about 511.3149714217. The cubic root of 261443 is about 63.9429015480.

The spelling of 261443 in words is "two hundred sixty-one thousand, four hundred forty-three".