11900561 has 8 divisors (see below), whose sum is σ = 12636000. Its totient is φ = 11169088.

The previous prime is 11900557. The next prime is 11900563. The reversal of 11900561 is 16500911.

11900561 is digitally balanced in base 2, because in such base 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 11900561 - 2² = 11900557 is a prime.

It is a super-2 number, since 2×11900561² = 283246704229442, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11900563) 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, 7190 + ... + 8688.

It is an arithmetic number, because the mean of its divisors is an integer number (1579500).

Almost surely, 2^11900561 is an apocalyptic number.

It is an amenable number.

11900561 is a deficient number, since it is larger than the sum of its proper divisors (735439).

11900561 is a wasteful number, since it uses less digits than its factorization.

11900561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1983.

The product of its (nonzero) digits is 270, while the sum is 23.

The square root of 11900561 is about 3449.7189740615. The cubic root of 11900561 is about 228.3087089908.

The spelling of 11900561 in words is "eleven million, nine hundred thousand, five hundred sixty-one".