11311261 has 4 divisors (see below), whose sum is σ = 12181372.
Its totient is φ = 10441152.
The previous prime is 11311253. The next prime is 11311283. The reversal of 11311261 is 16211311.
11311261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 6859161 + 4452100 = 2619^2 + 2110^2
It is a cyclic number.
It is not a de Polignac number, because 11311261 - 23 = 11311253 is a prime.
It is a super-3 number, since 3×113112613 (a number of 22 digits) contains 333 as substring.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (11311231) 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, 435036 + ... + 435061.
It is an arithmetic number, because the mean of its divisors is an integer number (3045343).
Almost surely, 211311261 is an apocalyptic number.
It is an amenable number.
11311261 is a deficient number, since it is larger than the sum of its proper divisors (870111).
11311261 is an equidigital number, since it uses as much as digits as its factorization.
11311261 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 870110.
The product of its digits is 36, while the sum is 16.
The square root of 11311261 is about 3363.2218184354.
The cubic root of 11311261 is about 224.4762203175.
Adding to 11311261 its reverse (16211311), we get a palindrome (27522572).
The spelling of 11311261 in words is "eleven million, three hundred eleven thousand, two hundred sixty-one".