11288981 has 8 divisors (see below), whose sum is σ = 12616128. Its totient is φ = 10012000.

The previous prime is 11288923. The next prime is 11288999. The reversal of 11288981 is 18988211.

It is a happy number.

11288981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 11288981 - 2¹⁸ = 11026837 is a prime.

It is a super-2 number, since 2×11288981² = 254882184036722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11288881) 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, 12065 + ... + 12966.

It is an arithmetic number, because the mean of its divisors is an integer number (1577016).

Almost surely, 2^11288981 is an apocalyptic number.

11288981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11288981 is a deficient number, since it is larger than the sum of its proper divisors (1327147).

11288981 is a wasteful number, since it uses less digits than its factorization.

11288981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25083.

The product of its digits is 9216, while the sum is 38.

The square root of 11288981 is about 3359.9078856421. The cubic root of 11288981 is about 224.3287384548.

The spelling of 11288981 in words is "eleven million, two hundred eighty-eight thousand, nine hundred eighty-one".