11655261 has 12 divisors (see below), whose sum is σ = 16991260. Its totient is φ = 7698888.

The previous prime is 11655257. The next prime is 11655269. The reversal of 11655261 is 16255611.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

11655261 is a `hidden beast` number, since 1 + 1 + 655 + 2 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4796100 + 6859161 = 2190^2 + 2619^2 .

It is not a de Polignac number, because 11655261 - 2² = 11655257 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 (11655269) 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 11 ways as a sum of consecutive naturals, for example, 106875 + ... + 106983.

Almost surely, 2^11655261 is an apocalyptic number.

It is an amenable number.

11655261 is a deficient number, since it is larger than the sum of its proper divisors (5335999).

11655261 is an frugal number, since it uses more digits than its factorization.

11655261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333 (or 112 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 11655261 is about 3413.9802284137. The cubic root of 11655261 is about 226.7291367127.

The spelling of 11655261 in words is "eleven million, six hundred fifty-five thousand, two hundred sixty-one".