261342223 has 4 divisors (see below), whose sum is σ = 261374560. Its totient is φ = 261309888.

The previous prime is 261342203. The next prime is 261342233. The reversal of 261342223 is 322243162.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 322243162 = 2 ⋅161121581.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261342223 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 (261342203) 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, 7711 + ... + 24127.

It is an arithmetic number, because the mean of its divisors is an integer number (65343640).

Almost surely, 2^261342223 is an apocalyptic number.

261342223 is a deficient number, since it is larger than the sum of its proper divisors (32337).

261342223 is a wasteful number, since it uses less digits than its factorization.

261342223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32336.

The product of its digits is 3456, while the sum is 25.

The square root of 261342223 is about 16166.0824877272. The cubic root of 261342223 is about 639.3468458551.

Adding to 261342223 its reverse (322243162), we get a palindrome (583585385).

The spelling of 261342223 in words is "two hundred sixty-one million, three hundred forty-two thousand, two hundred twenty-three".