2861565 has 16 divisors (see below), whose sum is σ = 5232768. Its totient is φ = 1308096.

The previous prime is 2861561. The next prime is 2861569. The reversal of 2861565 is 5651682.

It is an interprime number because it is at equal distance from previous prime (2861561) and next prime (2861569).

It is not a de Polignac number, because 2861565 - 2² = 2861561 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2861561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13522 + ... + 13731.

It is an arithmetic number, because the mean of its divisors is an integer number (327048).

2^2861565 is an apocalyptic number.

It is an amenable number.

2861565 is a deficient number, since it is larger than the sum of its proper divisors (2371203).

2861565 is a wasteful number, since it uses less digits than its factorization.

2861565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27268.

The product of its digits is 14400, while the sum is 33.

The square root of 2861565 is about 1691.6160911980. The cubic root of 2861565 is about 141.9715111796.

It can be divided in two parts, 28615 and 65, that added together give a triangular number (28680 = T₂₃₉).

The spelling of 2861565 in words is "two million, eight hundred sixty-one thousand, five hundred sixty-five".