261613223 has 4 divisors (see below), whose sum is σ = 275382360. Its totient is φ = 247844088.

The previous prime is 261613133. The next prime is 261613229. The reversal of 261613223 is 322316162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261613223 - 2²² = 257418919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261613192 and 261613201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261613229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6884540 + ... + 6884577.

It is an arithmetic number, because the mean of its divisors is an integer number (68845590).

Almost surely, 2^261613223 is an apocalyptic number.

261613223 is a deficient number, since it is larger than the sum of its proper divisors (13769137).

261613223 is a wasteful number, since it uses less digits than its factorization.

261613223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13769136.

The product of its digits is 2592, while the sum is 26.

The square root of 261613223 is about 16174.4620621522. The cubic root of 261613223 is about 639.5677607142.

Adding to 261613223 its reverse (322316162), we get a palindrome (583929385).

The spelling of 261613223 in words is "two hundred sixty-one million, six hundred thirteen thousand, two hundred twenty-three".