11651261 has 4 divisors (see below), whose sum is σ = 11848800. Its totient is φ = 11453724.

The previous prime is 11651249. The next prime is 11651267. The reversal of 11651261 is 16215611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11651261 - 2¹⁰ = 11650237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11651267) 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 3 ways as a sum of consecutive naturals, for example, 98681 + ... + 98798.

It is an arithmetic number, because the mean of its divisors is an integer number (2962200).

Almost surely, 2^11651261 is an apocalyptic number.

It is an amenable number.

11651261 is a deficient number, since it is larger than the sum of its proper divisors (197539).

11651261 is an equidigital number, since it uses as much as digits as its factorization.

11651261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197538.

The product of its digits is 360, while the sum is 23.

The square root of 11651261 is about 3413.3943516681. The cubic root of 11651261 is about 226.7031964866.

Adding to 11651261 its reverse (16215611), we get a palindrome (27866872).

The spelling of 11651261 in words is "eleven million, six hundred fifty-one thousand, two hundred sixty-one".