2155512 has 64 divisors (see below), whose sum is σ = 5904000. Its totient is φ = 653184.

The previous prime is 2155511. The next prime is 2155513.

2155512 is nontrivially palindromic in base 10.

2155512 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2155511) and next prime (2155513).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155511) 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, 13143 + ... + 13305.

It is an arithmetic number, because the mean of its divisors is an integer number (92250).

2^2155512 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 2155512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2952000).

2155512 is an abundant number, since it is smaller than the sum of its proper divisors (3748488).

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

2155512 is a wasteful number, since it uses less digits than its factorization.

2155512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 216 counting only the distinct ones).

The product of its digits is 500, while the sum is 21.

The square root of 2155512 is about 1468.1662031255. The cubic root of 2155512 is about 129.1764905928.

The spelling of 2155512 in words is "two million, one hundred fifty-five thousand, five hundred twelve".