11720261 has 12 divisors (see below), whose sum is σ = 13894092. Its totient is φ = 9854208.

The previous prime is 11720257. The next prime is 11720281. The reversal of 11720261 is 16202711.

11720261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2869636 + 8850625 = 1694^2 + 2975^2 .

It is not a de Polignac number, because 11720261 - 2² = 11720257 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 (11720251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 341 + ... + 4853.

It is an arithmetic number, because the mean of its divisors is an integer number (1157841).

Almost surely, 2^11720261 is an apocalyptic number.

It is an amenable number.

11720261 is a deficient number, since it is larger than the sum of its proper divisors (2173831).

11720261 is an equidigital number, since it uses as much as digits as its factorization.

11720261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4580 (or 4573 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 11720261 is about 3423.4866729695. The cubic root of 11720261 is about 227.1498360639.

Adding to 11720261 its reverse (16202711), we get a palindrome (27922972).

The spelling of 11720261 in words is "eleven million, seven hundred twenty thousand, two hundred sixty-one".