11918661 has 8 divisors (see below), whose sum is σ = 15944544. Its totient is φ = 7919280.

The previous prime is 11918657. The next prime is 11918671. The reversal of 11918661 is 16681911.

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

It is not a de Polignac number, because 11918661 - 2² = 11918657 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11918671) 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, 5550 + ... + 7391.

It is an arithmetic number, because the mean of its divisors is an integer number (1993068).

Almost surely, 2^11918661 is an apocalyptic number.

It is an amenable number.

11918661 is a deficient number, since it is larger than the sum of its proper divisors (4025883).

11918661 is a wasteful number, since it uses less digits than its factorization.

11918661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13251.

The product of its digits is 2592, while the sum is 33.

The square root of 11918661 is about 3452.3413794119. The cubic root of 11918661 is about 228.4243980570.

The spelling of 11918661 in words is "eleven million, nine hundred eighteen thousand, six hundred sixty-one".