2181550 has 48 divisors (see below), whose sum is σ = 4856832. Its totient is φ = 712800.

The previous prime is 2181547. The next prime is 2181551. The reversal of 2181550 is 551812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181551) 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, 7915 + ... + 8185.

It is an arithmetic number, because the mean of its divisors is an integer number (101184).

2^2181550 is an apocalyptic number.

2181550 is an abundant number, since it is smaller than the sum of its proper divisors (2675282).

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

2181550 is a wasteful number, since it uses less digits than its factorization.

2181550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313 (or 308 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 2181550 is about 1477.0071089876. The cubic root of 2181550 is about 129.6945491402.

The spelling of 2181550 in words is "two million, one hundred eighty-one thousand, five hundred fifty".