11215261 has 4 divisors (see below), whose sum is σ = 11234524. Its totient is φ = 11196000.

The previous prime is 11215247. The next prime is 11215271. The reversal of 11215261 is 16251211.

11215261 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 4995225 + 6220036 = 2235^2 + 2494^2 .

It is a cyclic number.

It is not a de Polignac number, because 11215261 - 2⁵ = 11215229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11215201) 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, 8730 + ... + 9931.

It is an arithmetic number, because the mean of its divisors is an integer number (2808631).

Almost surely, 2^11215261 is an apocalyptic number.

It is an amenable number.

11215261 is a deficient number, since it is larger than the sum of its proper divisors (19263).

11215261 is an equidigital number, since it uses as much as digits as its factorization.

11215261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19262.

The product of its digits is 120, while the sum is 19.

The square root of 11215261 is about 3348.9193779487. The cubic root of 11215261 is about 223.8393631998.

Adding to 11215261 its reverse (16251211), we get a palindrome (27466472).

It can be divided in two parts, 11215 and 261, that added together give a triangular number (11476 = T₁₅₁).

The spelling of 11215261 in words is "eleven million, two hundred fifteen thousand, two hundred sixty-one".