11561890 has 16 divisors (see below), whose sum is σ = 20855232. Its totient is φ = 4615024.

The previous prime is 11561863. The next prime is 11561903. The reversal of 11561890 is 9816511.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5577 + ... + 7363.

It is an arithmetic number, because the mean of its divisors is an integer number (1303452).

Almost surely, 2^11561890 is an apocalyptic number.

11561890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11561890 is a deficient number, since it is larger than the sum of its proper divisors (9293342).

11561890 is a wasteful number, since it uses less digits than its factorization.

11561890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2441.

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 11561890 is about 3400.2779298169. The cubic root of 11561890 is about 226.1220657840.

The spelling of 11561890 in words is "eleven million, five hundred sixty-one thousand, eight hundred ninety".