11091861 has 24 divisors (see below), whose sum is σ = 17603040. Its totient is φ = 6674400.

The previous prime is 11091851. The next prime is 11091869. The reversal of 11091861 is 16819011.

It is not a de Polignac number, because 11091861 - 2¹⁸ = 10829717 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11091869) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17610 + ... + 18228.

It is an arithmetic number, because the mean of its divisors is an integer number (733460).

Almost surely, 2^11091861 is an apocalyptic number.

11091861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11091861 is a deficient number, since it is larger than the sum of its proper divisors (6511179).

11091861 is a wasteful number, since it uses less digits than its factorization.

11091861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817 (or 814 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 27.

The square root of 11091861 is about 3330.4445649192. Note that the first 3 decimals coincide. The cubic root of 11091861 is about 223.0153756148.

The spelling of 11091861 in words is "eleven million, ninety-one thousand, eight hundred sixty-one".