2161554 has 32 divisors (see below), whose sum is σ = 4634880. Its totient is φ = 670032.

The previous prime is 2161553. The next prime is 2161571. The reversal of 2161554 is 4551612.

2161554 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (2161553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7497 + ... + 7779.

It is an arithmetic number, because the mean of its divisors is an integer number (144840).

2^2161554 is an apocalyptic number.

2161554 is an abundant number, since it is smaller than the sum of its proper divisors (2473326).

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

2161554 is a wasteful number, since it uses less digits than its factorization.

2161554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374.

The product of its digits is 1200, while the sum is 24.

The square root of 2161554 is about 1470.2224321510. Note that the first 3 decimals coincide. The cubic root of 2161554 is about 129.2970738920.

It can be divided in two parts, 216 and 1554, that added together give a triangular number (1770 = T₅₉).

The spelling of 2161554 in words is "two million, one hundred sixty-one thousand, five hundred fifty-four".