11216881 has 8 divisors (see below), whose sum is σ = 12496680. Its totient is φ = 9996672.

The previous prime is 11216861. The next prime is 11216911. The reversal of 11216881 is 18861211.

It can be written as a sum of positive squares in 4 ways, for example, as 2835856 + 8381025 = 1684^2 + 2895^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11216881 - 2⁹ = 11216369 is a prime.

It is a super-2 number, since 2×11216881² = 251636838736322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11216861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14500 + ... + 15253.

It is an arithmetic number, because the mean of its divisors is an integer number (1562085).

Almost surely, 2^11216881 is an apocalyptic number.

It is an amenable number.

11216881 is a deficient number, since it is larger than the sum of its proper divisors (1279799).

11216881 is a wasteful number, since it uses less digits than its factorization.

11216881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29795.

The product of its digits is 768, while the sum is 28.

The square root of 11216881 is about 3349.1612382804. The cubic root of 11216881 is about 223.8501402505.

The spelling of 11216881 in words is "eleven million, two hundred sixteen thousand, eight hundred eighty-one".