2515861 has 4 divisors (see below), whose sum is σ = 2519424. Its totient is φ = 2512300.

The previous prime is 2515859. The next prime is 2515871. The reversal of 2515861 is 1685152.

2515861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2515861 - 2¹ = 2515859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2515871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325 + ... + 2266.

It is an arithmetic number, because the mean of its divisors is an integer number (629856).

2^2515861 is an apocalyptic number.

It is an amenable number.

2515861 is a deficient number, since it is larger than the sum of its proper divisors (3563).

2515861 is an equidigital number, since it uses as much as digits as its factorization.

2515861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3562.

The product of its digits is 2400, while the sum is 28.

The square root of 2515861 is about 1586.1465884337. The cubic root of 2515861 is about 136.0072984838.

The spelling of 2515861 in words is "two million, five hundred fifteen thousand, eight hundred sixty-one".