11199861 has 6 divisors (see below), whose sum is σ = 16177590. Its totient is φ = 7466568.

The previous prime is 11199857. The next prime is 11199869. The reversal of 11199861 is 16899111.

It can be written as a sum of positive squares in only one way, i.e., 10400625 + 799236 = 3225^2 + 894^2 .

It is not a de Polignac number, because 11199861 - 2² = 11199857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11199869) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 622206 + ... + 622223.

It is an arithmetic number, because the mean of its divisors is an integer number (2696265).

Almost surely, 2^11199861 is an apocalyptic number.

It is an amenable number.

11199861 is a deficient number, since it is larger than the sum of its proper divisors (4977729).

11199861 is a wasteful number, since it uses less digits than its factorization.

11199861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244435 (or 1244432 counting only the distinct ones).

The product of its digits is 3888, while the sum is 36.

The square root of 11199861 is about 3346.6193389748. The cubic root of 11199861 is about 223.7368628305.

The spelling of 11199861 in words is "eleven million, one hundred ninety-nine thousand, eight hundred sixty-one".