11661313 has 4 divisors (see below), whose sum is σ = 11726640. Its totient is φ = 11595988.

The previous prime is 11661289. The next prime is 11661317. The reversal of 11661313 is 31316611.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31316611 = 3539 ⋅8849.

It is a cyclic number.

It is not a de Polignac number, because 11661313 - 2⁵ = 11661281 is a prime.

It is a super-3 number, since 3×11661313³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11661317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32395 + ... + 32752.

It is an arithmetic number, because the mean of its divisors is an integer number (2931660).

It is a Proth number, since it is equal to 2847 ⋅ 2¹² + 1 and 2847 < 2¹².

Almost surely, 2^11661313 is an apocalyptic number.

It is an amenable number.

11661313 is a deficient number, since it is larger than the sum of its proper divisors (65327).

11661313 is an equidigital number, since it uses as much as digits as its factorization.

11661313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65326.

The product of its digits is 324, while the sum is 22.

The square root of 11661313 is about 3414.8664688389. The cubic root of 11661313 is about 226.7683729942.

Adding to 11661313 its reverse (31316611), we get a palindrome (42977924).

The spelling of 11661313 in words is "eleven million, six hundred sixty-one thousand, three hundred thirteen".