2561515 has 8 divisors (see below), whose sum is σ = 3353328. Its totient is φ = 1862880.

The previous prime is 2561513. The next prime is 2561521. The reversal of 2561515 is 5151652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2561515 - 2¹ = 2561513 is a prime.

It is a super-2 number, since 2×2561515² = 13122718190450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2561515.

It is not an unprimeable number, because it can be changed into a prime (2561513) 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 7 ways as a sum of consecutive naturals, for example, 23232 + ... + 23341.

It is an arithmetic number, because the mean of its divisors is an integer number (419166).

2^2561515 is an apocalyptic number.

2561515 is a deficient number, since it is larger than the sum of its proper divisors (791813).

2561515 is a wasteful number, since it uses less digits than its factorization.

2561515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46589.

The product of its digits is 1500, while the sum is 25.

The square root of 2561515 is about 1600.4733674760. The cubic root of 2561515 is about 136.8250559705.

It can be divided in two parts, 256 and 1515, that added together give a palindrome (1771).

The spelling of 2561515 in words is "two million, five hundred sixty-one thousand, five hundred fifteen".