261316226 has 4 divisors (see below), whose sum is σ = 391974342. Its totient is φ = 130658112.

The previous prime is 261316219. The next prime is 261316249. The reversal of 261316226 is 622613162.

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

It can be written as a sum of positive squares in only one way, i.e., 250747225 + 10569001 = 15835^2 + 3251^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65329055 + ... + 65329058.

Almost surely, 2^261316226 is an apocalyptic number.

261316226 is a deficient number, since it is larger than the sum of its proper divisors (130658116).

261316226 is a wasteful number, since it uses less digits than its factorization.

261316226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130658115.

The product of its digits is 5184, while the sum is 29.

The square root of 261316226 is about 16165.2784077479. The cubic root of 261316226 is about 639.3256454907.

Adding to 261316226 its reverse (622613162), we get a palindrome (883929388).

The spelling of 261316226 in words is "two hundred sixty-one million, three hundred sixteen thousand, two hundred twenty-six".