2161455 has 16 divisors (see below), whose sum is σ = 3494400. Its totient is φ = 1140768.

The previous prime is 2161447. The next prime is 2161469. The reversal of 2161455 is 5541612.

It is not a de Polignac number, because 2161455 - 2³ = 2161447 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 846 + ... + 2244.

It is an arithmetic number, because the mean of its divisors is an integer number (218400).

2^2161455 is an apocalyptic number.

2161455 is a deficient number, since it is larger than the sum of its proper divisors (1332945).

2161455 is a wasteful number, since it uses less digits than its factorization.

2161455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510.

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

The square root of 2161455 is about 1470.1887633906. The cubic root of 2161455 is about 129.2950999101.

The spelling of 2161455 in words is "two million, one hundred sixty-one thousand, four hundred fifty-five".