11721261 has 8 divisors (see below), whose sum is σ = 15703264. Its totient is φ = 7776720.

The previous prime is 11721257. The next prime is 11721263. The reversal of 11721261 is 16212711.

It is a happy number.

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

It is not a de Polignac number, because 11721261 - 2² = 11721257 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 (11721263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8626 + ... + 9891.

It is an arithmetic number, because the mean of its divisors is an integer number (1962908).

Almost surely, 2^11721261 is an apocalyptic number.

It is an amenable number.

11721261 is a deficient number, since it is larger than the sum of its proper divisors (3982003).

11721261 is a wasteful number, since it uses less digits than its factorization.

11721261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18731.

The product of its digits is 168, while the sum is 21.

The square root of 11721261 is about 3423.6327197876. The cubic root of 11721261 is about 227.1562961981.

Adding to 11721261 its reverse (16212711), we get a palindrome (27933972).

The spelling of 11721261 in words is "eleven million, seven hundred twenty-one thousand, two hundred sixty-one".