261222231 has 8 divisors (see below), whose sum is σ = 348571264. Its totient is φ = 174010680.

The previous prime is 261222217. The next prime is 261222233. The reversal of 261222231 is 132222162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261222231 - 2⁶ = 261222167 is a prime.

It is a super-2 number, since 2×261222231² = 136474107937234722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261222198 and 261222207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261222233) 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 7 ways as a sum of consecutive naturals, for example, 29851 + ... + 37596.

It is an arithmetic number, because the mean of its divisors is an integer number (43571408).

Almost surely, 2^261222231 is an apocalyptic number.

261222231 is a deficient number, since it is larger than the sum of its proper divisors (87349033).

261222231 is a wasteful number, since it uses less digits than its factorization.

261222231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68741.

The product of its digits is 576, while the sum is 21.

The square root of 261222231 is about 16162.3708347507. The cubic root of 261222231 is about 639.2489815172.

Adding to 261222231 its reverse (132222162), we get a palindrome (393444393).

The spelling of 261222231 in words is "two hundred sixty-one million, two hundred twenty-two thousand, two hundred thirty-one".