2541865 has 4 divisors (see below), whose sum is σ = 3050244. Its totient is φ = 2033488.

The previous prime is 2541853. The next prime is 2541883. The reversal of 2541865 is 5681452.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2027776 + 514089 = 1424^2 + 717^2 .

It is a cyclic number.

It is not a de Polignac number, because 2541865 - 2¹³ = 2533673 is a prime.

It is a super-2 number, since 2×2541865² = 12922155356450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254182 + ... + 254191.

It is an arithmetic number, because the mean of its divisors is an integer number (762561).

2^2541865 is an apocalyptic number.

It is an amenable number.

2541865 is a deficient number, since it is larger than the sum of its proper divisors (508379).

2541865 is an equidigital number, since it uses as much as digits as its factorization.

2541865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508378.

The product of its digits is 9600, while the sum is 31.

The square root of 2541865 is about 1594.3227402255. The cubic root of 2541865 is about 136.4742848059.

The spelling of 2541865 in words is "two million, five hundred forty-one thousand, eight hundred sixty-five".