2157515 has 16 divisors (see below), whose sum is σ = 2749248. Its totient is φ = 1622016.

The previous prime is 2157511. The next prime is 2157517. The reversal of 2157515 is 5157512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2157515 - 2² = 2157511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8267 + ... + 8523.

It is an arithmetic number, because the mean of its divisors is an integer number (171828).

2^2157515 is an apocalyptic number.

2157515 is a deficient number, since it is larger than the sum of its proper divisors (591733).

2157515 is a wasteful number, since it uses less digits than its factorization.

2157515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358.

The product of its digits is 1750, while the sum is 26.

The square root of 2157515 is about 1468.8481882073. The cubic root of 2157515 is about 129.2164904332.

The spelling of 2157515 in words is "two million, one hundred fifty-seven thousand, five hundred fifteen".