2159515 has 4 divisors (see below), whose sum is σ = 2591424. Its totient is φ = 1727608.

The previous prime is 2159513. The next prime is 2159519. The reversal of 2159515 is 5159512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2159515 - 2¹ = 2159513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2159513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215947 + ... + 215956.

It is an arithmetic number, because the mean of its divisors is an integer number (647856).

2^2159515 is an apocalyptic number.

2159515 is a deficient number, since it is larger than the sum of its proper divisors (431909).

2159515 is an equidigital number, since it uses as much as digits as its factorization.

2159515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431908.

The product of its digits is 2250, while the sum is 28.

The square root of 2159515 is about 1469.5288360560. The cubic root of 2159515 is about 129.2564056701.

It can be divided in two parts, 215 and 9515, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 2159515 in words is "two million, one hundred fifty-nine thousand, five hundred fifteen".