2161544 has 64 divisors (see below), whose sum is σ = 5270400. Its totient is φ = 813120.

The previous prime is 2161513. The next prime is 2161553. The reversal of 2161544 is 4451612.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74522 + ... + 74550.

It is an arithmetic number, because the mean of its divisors is an integer number (82350).

2^2161544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2161544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2635200).

2161544 is an abundant number, since it is smaller than the sum of its proper divisors (3108856).

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

2161544 is a wasteful number, since it uses less digits than its factorization.

2161544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75 (or 49 counting only the distinct ones).

The product of its digits is 960, while the sum is 23.

The square root of 2161544 is about 1470.2190313011. The cubic root of 2161544 is about 129.2968745026.

The spelling of 2161544 in words is "two million, one hundred sixty-one thousand, five hundred forty-four".