11303981 has 16 divisors (see below), whose sum is σ = 12716928. Its totient is φ = 9979200.

The previous prime is 11303911. The next prime is 11303989. The reversal of 11303981 is 18930311.

It is a cyclic number.

It is not a de Polignac number, because 11303981 - 2¹⁰ = 11302957 is a prime.

It is a super-3 number, since 3×11303981³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11303981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11303989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33986 + ... + 34316.

It is an arithmetic number, because the mean of its divisors is an integer number (794808).

Almost surely, 2^11303981 is an apocalyptic number.

It is an amenable number.

11303981 is a deficient number, since it is larger than the sum of its proper divisors (1412947).

11303981 is a wasteful number, since it uses less digits than its factorization.

11303981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 11303981 is about 3362.1393486886. The cubic root of 11303981 is about 224.4280518713.

The spelling of 11303981 in words is "eleven million, three hundred three thousand, nine hundred eighty-one".