11661861 has 8 divisors (see below), whose sum is σ = 15569280. Its totient is φ = 7764512.

The previous prime is 11661841. The next prime is 11661863. The reversal of 11661861 is 16816611.

It is a happy number.

11661861 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11661861 - 2⁵ = 11661829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11661863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 820 + ... + 4898.

It is an arithmetic number, because the mean of its divisors is an integer number (1946160).

Almost surely, 2^11661861 is an apocalyptic number.

It is an amenable number.

11661861 is a deficient number, since it is larger than the sum of its proper divisors (3907419).

11661861 is an equidigital number, since it uses as much as digits as its factorization.

11661861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5035.

The product of its digits is 1728, while the sum is 30.

The square root of 11661861 is about 3414.9467052942. The cubic root of 11661861 is about 226.7719251134.

The spelling of 11661861 in words is "eleven million, six hundred sixty-one thousand, eight hundred sixty-one".