2161506 has 16 divisors (see below), whose sum is σ = 4462848. Its totient is φ = 697200.

The previous prime is 2161493. The next prime is 2161513. The reversal of 2161506 is 6051612.

It is a happy number.

2161506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5625 + ... + 5996.

It is an arithmetic number, because the mean of its divisors is an integer number (278928).

2^2161506 is an apocalyptic number.

2161506 is an abundant number, since it is smaller than the sum of its proper divisors (2301342).

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

2161506 is a wasteful number, since it uses less digits than its factorization.

2161506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11657.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 2161506 is about 1470.2061079998. The cubic root of 2161506 is about 129.2961168174.

The spelling of 2161506 in words is "two million, one hundred sixty-one thousand, five hundred six".