11003861 has 12 divisors (see below), whose sum is σ = 12180672. Its totient is φ = 9933000.

The previous prime is 11003857. The next prime is 11003893. The reversal of 11003861 is 16830011.

It is not a de Polignac number, because 11003861 - 2² = 11003857 is a prime.

It is a Duffinian number.

11003861 is a modest number, since divided by 3861 gives 11 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11000861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25316 + ... + 25746.

It is an arithmetic number, because the mean of its divisors is an integer number (1015056).

Almost surely, 2^11003861 is an apocalyptic number.

11003861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11003861 is the 1484-th centered decagonal number.

It is an amenable number.

11003861 is a deficient number, since it is larger than the sum of its proper divisors (1176811).

11003861 is a wasteful number, since it uses less digits than its factorization.

11003861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664 (or 653 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 11003861 is about 3317.2068069386. The cubic root of 11003861 is about 222.4240265802.

Adding to 11003861 its reverse (16830011), we get a palindrome (27833872).

The spelling of 11003861 in words is "eleven million, three thousand, eight hundred sixty-one".