11561900 has 72 divisors (see below), whose sum is σ = 29164800. Its totient is φ = 3896640.

The previous prime is 11561863. The next prime is 11561903. The reversal of 11561900 is 916511.

11561900 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×11561900² = 267355063220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11561903) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58001 + ... + 58199.

Almost surely, 2^11561900 is an apocalyptic number.

11561900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11561900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14582400).

11561900 is an abundant number, since it is smaller than the sum of its proper divisors (17602900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11561900 is a wasteful number, since it uses less digits than its factorization.

11561900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303 (or 296 counting only the distinct ones).

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

The square root of 11561900 is about 3400.2794002846. The cubic root of 11561900 is about 226.1221309757.

The spelling of 11561900 in words is "eleven million, five hundred sixty-one thousand, nine hundred".