11561004 has 72 divisors (see below), whose sum is σ = 35977760. Its totient is φ = 3048192.

The previous prime is 11560981. The next prime is 11561021. The reversal of 11561004 is 40016511.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1512 + ... + 5040.

Almost surely, 2^11561004 is an apocalyptic number.

11561004 is a gapful number since it is divisible by the number (14) 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 11561004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17988880).

11561004 is an abundant number, since it is smaller than the sum of its proper divisors (24416756).

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

11561004 is a wasteful number, since it uses less digits than its factorization.

11561004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3559 (or 3554 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 11561004 is about 3400.1476438531. The cubic root of 11561004 is about 226.1162896445.

Adding to 11561004 its reverse (40016511), we get a palindrome (51577515).

The spelling of 11561004 in words is "eleven million, five hundred sixty-one thousand, four".