11811261 has 16 divisors (see below), whose sum is σ = 19634688. Its totient is φ = 6135600.

The previous prime is 11811253. The next prime is 11811271. The reversal of 11811261 is 16211811.

It is a happy number.

It is not a de Polignac number, because 11811261 - 2³ = 11811253 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11811221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25335 + ... + 25796.

It is an arithmetic number, because the mean of its divisors is an integer number (1227168).

Almost surely, 2^11811261 is an apocalyptic number.

11811261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11811261 is a deficient number, since it is larger than the sum of its proper divisors (7823427).

11811261 is a wasteful number, since it uses less digits than its factorization.

11811261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51152.

The product of its digits is 96, while the sum is 21.

The square root of 11811261 is about 3436.7515185128. The cubic root of 11811261 is about 227.7362100012.

It can be divided in two parts, 1181 and 1261, that added together give a palindrome (2442).

The spelling of 11811261 in words is "eleven million, eight hundred eleven thousand, two hundred sixty-one".