11993661 has 12 divisors (see below), whose sum is σ = 17792892. Its totient is φ = 7779456.

The previous prime is 11993659. The next prime is 11993669. The reversal of 11993661 is 16639911.

11993661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 8732025 + 3261636 = 2955^2 + 1806^2 .

It is not a de Polignac number, because 11993661 - 2¹ = 11993659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11993669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17676 + ... + 18341.

It is an arithmetic number, because the mean of its divisors is an integer number (1482741).

Almost surely, 2^11993661 is an apocalyptic number.

It is an amenable number.

11993661 is a deficient number, since it is larger than the sum of its proper divisors (5799231).

11993661 is a wasteful number, since it uses less digits than its factorization.

11993661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36060 (or 36057 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 11993661 is about 3463.1865384354. The cubic root of 11993661 is about 228.9025283902.

The spelling of 11993661 in words is "eleven million, nine hundred ninety-three thousand, six hundred sixty-one".