11661043 has 4 divisors (see below), whose sum is σ = 11668888. Its totient is φ = 11653200.

The previous prime is 11661037. The next prime is 11661059. The reversal of 11661043 is 34016611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 11661043 - 2⁵ = 11661011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11661073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 933 + ... + 4918.

It is an arithmetic number, because the mean of its divisors is an integer number (2917222).

Almost surely, 2^11661043 is an apocalyptic number.

11661043 is a deficient number, since it is larger than the sum of its proper divisors (7845).

11661043 is an equidigital number, since it uses as much as digits as its factorization.

11661043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7844.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 11661043 is about 3414.8269355855. The cubic root of 11661043 is about 226.7666228215.

Adding to 11661043 its reverse (34016611), we get a palindrome (45677654).

It can be divided in two parts, 1166 and 1043, that added together give a square (2209 = 47²).

The spelling of 11661043 in words is "eleven million, six hundred sixty-one thousand, forty-three".