11516881 has 2 divisors, whose sum is σ = 11516882. Its totient is φ = 11516880.

The previous prime is 11516873. The next prime is 11516887. The reversal of 11516881 is 18861511.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9979281 + 1537600 = 3159^2 + 1240^2 .

It is a cyclic number.

It is not a de Polignac number, because 11516881 - 2³ = 11516873 is a prime.

It is a super-2 number, since 2×11516881² = 265277095936322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11516887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5758440 + 5758441.

It is an arithmetic number, because the mean of its divisors is an integer number (5758441).

Almost surely, 2^11516881 is an apocalyptic number.

It is an amenable number.

11516881 is a deficient number, since it is larger than the sum of its proper divisors (1).

11516881 is an equidigital number, since it uses as much as digits as its factorization.

11516881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 31.

The square root of 11516881 is about 3393.6530464972. The cubic root of 11516881 is about 225.8282625127.

The spelling of 11516881 in words is "eleven million, five hundred sixteen thousand, eight hundred eighty-one".