2129515 has 4 divisors (see below), whose sum is σ = 2555424. Its totient is φ = 1703608.

The previous prime is 2129513. The next prime is 2129521. The reversal of 2129515 is 5159212.

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 2129515 - 2¹ = 2129513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2129515.

It is not an unprimeable number, because it can be changed into a prime (2129513) 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, 212947 + ... + 212956.

It is an arithmetic number, because the mean of its divisors is an integer number (638856).

2^2129515 is an apocalyptic number.

2129515 is a deficient number, since it is larger than the sum of its proper divisors (425909).

2129515 is an equidigital number, since it uses as much as digits as its factorization.

2129515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425908.

The product of its digits is 900, while the sum is 25.

The square root of 2129515 is about 1459.2857842109. The cubic root of 2129515 is about 128.6550687402.

The spelling of 2129515 in words is "two million, one hundred twenty-nine thousand, five hundred fifteen".