11553881 has 4 divisors (see below), whose sum is σ = 12162000. Its totient is φ = 10945764.

The previous prime is 11553859. The next prime is 11553887. The reversal of 11553881 is 18835511.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11553881 is a prime.

It is a super-2 number, since 2×11553881² = 266984332324322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11553887) 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, 304031 + ... + 304068.

It is an arithmetic number, because the mean of its divisors is an integer number (3040500).

Almost surely, 2^11553881 is an apocalyptic number.

It is an amenable number.

11553881 is a deficient number, since it is larger than the sum of its proper divisors (608119).

11553881 is an equidigital number, since it uses as much as digits as its factorization.

11553881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608118.

The product of its digits is 4800, while the sum is 32.

The square root of 11553881 is about 3399.1000279486. The cubic root of 11553881 is about 226.0698416247.

The spelling of 11553881 in words is "eleven million, five hundred fifty-three thousand, eight hundred eighty-one".