11803661 has 4 divisors (see below), whose sum is σ = 12498012. Its totient is φ = 11109312.

The previous prime is 11803657. The next prime is 11803663. The reversal of 11803661 is 16630811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16630811 = 17 ⋅978283.

It can be written as a sum of positive squares in 2 ways, for example, as 10278436 + 1525225 = 3206^2 + 1235^2 .

It is a cyclic number.

It is not a de Polignac number, because 11803661 - 2² = 11803657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11803661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11803663) 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, 347150 + ... + 347183.

It is an arithmetic number, because the mean of its divisors is an integer number (3124503).

Almost surely, 2^11803661 is an apocalyptic number.

It is an amenable number.

11803661 is a deficient number, since it is larger than the sum of its proper divisors (694351).

11803661 is an equidigital number, since it uses as much as digits as its factorization.

11803661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694350.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 11803661 is about 3435.6456452900. The cubic root of 11803661 is about 227.6873536158.

The spelling of 11803661 in words is "eleven million, eight hundred three thousand, six hundred sixty-one".