261226011 has 8 divisors (see below), whose sum is σ = 348382224. Its totient is φ = 174110240.

The previous prime is 261225971. The next prime is 261226013. The reversal of 261226011 is 110622162.

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

It is a cyclic number.

It is not a de Polignac number, because 261226011 - 2²² = 257031707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261226013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11665 + ... + 25661.

It is an arithmetic number, because the mean of its divisors is an integer number (43547778).

Almost surely, 2^261226011 is an apocalyptic number.

261226011 is a deficient number, since it is larger than the sum of its proper divisors (87156213).

261226011 is a wasteful number, since it uses less digits than its factorization.

261226011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20221.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 261226011 is about 16162.4877726172. The cubic root of 261226011 is about 639.2520649065.

Adding to 261226011 its reverse (110622162), we get a palindrome (371848173).

The spelling of 261226011 in words is "two hundred sixty-one million, two hundred twenty-six thousand, eleven".