11720861 has 4 divisors (see below), whose sum is σ = 11748000. Its totient is φ = 11693724.

The previous prime is 11720851. The next prime is 11720873. The reversal of 11720861 is 16802711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11720861 - 2²² = 7526557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11720861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11720851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12911 + ... + 13788.

It is an arithmetic number, because the mean of its divisors is an integer number (2937000).

Almost surely, 2^11720861 is an apocalyptic number.

It is an amenable number.

11720861 is a deficient number, since it is larger than the sum of its proper divisors (27139).

11720861 is an equidigital number, since it uses as much as digits as its factorization.

11720861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27138.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 11720861 is about 3423.5743018080. The cubic root of 11720861 is about 227.1537121885.

The spelling of 11720861 in words is "eleven million, seven hundred twenty thousand, eight hundred sixty-one".