11609681 has 2 divisors, whose sum is σ = 11609682. Its totient is φ = 11609680.

The previous prime is 11609677. The next prime is 11609711. The reversal of 11609681 is 18690611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10627600 + 982081 = 3260^2 + 991^2 .

It is an emirp because it is prime and its reverse (18690611) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 18960911 and 11906981.

It is a cyclic number.

It is not a de Polignac number, because 11609681 - 2² = 11609677 is a prime.

It is a super-2 number, since 2×11609681² = 269569385843522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11609621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5804840 + 5804841.

It is an arithmetic number, because the mean of its divisors is an integer number (5804841).

Almost surely, 2^11609681 is an apocalyptic number.

It is an amenable number.

11609681 is a deficient number, since it is larger than the sum of its proper divisors (1).

11609681 is an equidigital number, since it uses as much as digits as its factorization.

11609681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 11609681 is about 3407.2981965188. The cubic root of 11609681 is about 226.4331955408.

The spelling of 11609681 in words is "eleven million, six hundred nine thousand, six hundred eighty-one".