11547881 has 2 divisors, whose sum is σ = 11547882. Its totient is φ = 11547880.

The previous prime is 11547871. The next prime is 11547917. The reversal of 11547881 is 18874511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9357481 + 2190400 = 3059^2 + 1480^2 .

It is an emirp because it is prime and its reverse (18874511) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11547881 is a prime.

It is a super-2 number, since 2×11547881² = 266707111180322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (11547871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5773940 + 5773941.

It is an arithmetic number, because the mean of its divisors is an integer number (5773941).

Almost surely, 2^11547881 is an apocalyptic number.

It is an amenable number.

11547881 is a deficient number, since it is larger than the sum of its proper divisors (1).

11547881 is an equidigital number, since it uses as much as digits as its factorization.

11547881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 35.

The square root of 11547881 is about 3398.2173267759. The cubic root of 11547881 is about 226.0307017052.

The spelling of 11547881 in words is "eleven million, five hundred forty-seven thousand, eight hundred eighty-one".