261443233 has 4 divisors (see below), whose sum is σ = 261761728. Its totient is φ = 261124740.

The previous prime is 261443201. The next prime is 261443239. The reversal of 261443233 is 332344162.

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.

It is a cyclic number.

It is not a de Polignac number, because 261443233 - 2⁵ = 261443201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261443239) 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, 158013 + ... + 159658.

It is an arithmetic number, because the mean of its divisors is an integer number (65440432).

Almost surely, 2^261443233 is an apocalyptic number.

It is an amenable number.

261443233 is a deficient number, since it is larger than the sum of its proper divisors (318495).

261443233 is an equidigital number, since it uses as much as digits as its factorization.

261443233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318494.

The product of its digits is 10368, while the sum is 28.

The square root of 261443233 is about 16169.2063194209. The cubic root of 261443233 is about 639.4292054343.

Adding to 261443233 its reverse (332344162), we get a palindrome (593787395).

The spelling of 261443233 in words is "two hundred sixty-one million, four hundred forty-three thousand, two hundred thirty-three".