2155515 has 32 divisors (see below), whose sum is σ = 3732480. Its totient is φ = 1058304.

The previous prime is 2155513. The next prime is 2155519. The reversal of 2155515 is 5155512.

It is not a de Polignac number, because 2155515 - 2¹ = 2155513 is a prime.

2155515 is a lucky 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 (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20092 + ... + 20198.

It is an arithmetic number, because the mean of its divisors is an integer number (116640).

2^2155515 is an apocalyptic number.

2155515 is a deficient number, since it is larger than the sum of its proper divisors (1576965).

2155515 is a wasteful number, since it uses less digits than its factorization.

2155515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211.

The product of its digits is 1250, while the sum is 24.

The square root of 2155515 is about 1468.1672248079. The cubic root of 2155515 is about 129.1765505213.

The spelling of 2155515 in words is "two million, one hundred fifty-five thousand, five hundred fifteen".