2511861 has 16 divisors (see below), whose sum is σ = 3694080. Its totient is φ = 1505520.

The previous prime is 2511851. The next prime is 2511871. The reversal of 2511861 is 1681152.

It is an interprime number because it is at equal distance from previous prime (2511851) and next prime (2511871).

It is not a de Polignac number, because 2511861 - 2⁹ = 2511349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2511811) 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 15 ways as a sum of consecutive naturals, for example, 3030 + ... + 3768.

It is an arithmetic number, because the mean of its divisors is an integer number (230880).

2^2511861 is an apocalyptic number.

It is an amenable number.

2511861 is a deficient number, since it is larger than the sum of its proper divisors (1182219).

2511861 is a wasteful number, since it uses less digits than its factorization.

2511861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856.

The product of its digits is 480, while the sum is 24.

The square root of 2511861 is about 1584.8851693419. The cubic root of 2511861 is about 135.9351803277.

It can be divided in two parts, 251 and 1861, that added together give a palindrome (2112).

The spelling of 2511861 in words is "two million, five hundred eleven thousand, eight hundred sixty-one".