12011550 has 24 divisors (see below), whose sum is σ = 29789016. Its totient is φ = 3203040.

The previous prime is 12011513. The next prime is 12011557. The reversal of 12011550 is 5511021.

12011550 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39889 + ... + 40188.

It is an arithmetic number, because the mean of its divisors is an integer number (1241209).

Almost surely, 2^12011550 is an apocalyptic number.

12011550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12011550 is an abundant number, since it is smaller than the sum of its proper divisors (17777466).

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

12011550 is a wasteful number, since it uses less digits than its factorization.

12011550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80092 (or 80087 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 15.

The square root of 12011550 is about 3465.7683130873. The cubic root of 12011550 is about 229.0162774545.

Adding to 12011550 its reverse (5511021), we get a palindrome (17522571).

It can be divided in two parts, 12011 and 550, that added together give a triangular number (12561 = T₁₅₈).

The spelling of 12011550 in words is "twelve million, eleven thousand, five hundred fifty".