2505861 has 12 divisors (see below), whose sum is σ = 3744780. Its totient is φ = 1612800.

The previous prime is 2505859. The next prime is 2505863. The reversal of 2505861 is 1685052.

It is an interprime number because it is at equal distance from previous prime (2505859) and next prime (2505863).

It can be written as a sum of positive squares in 2 ways, for example, as 1640961 + 864900 = 1281^2 + 930^2 .

It is not a de Polignac number, because 2505861 - 2¹ = 2505859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2505863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4540 + ... + 5061.

It is an arithmetic number, because the mean of its divisors is an integer number (312065).

2^2505861 is an apocalyptic number.

It is an amenable number.

2505861 is a deficient number, since it is larger than the sum of its proper divisors (1238919).

2505861 is a wasteful number, since it uses less digits than its factorization.

2505861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9636 (or 9633 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 2505861 is about 1582.9911560081. The cubic root of 2505861 is about 135.8268593985.

The spelling of 2505861 in words is "two million, five hundred five thousand, eight hundred sixty-one".