2015641 has 4 divisors (see below), whose sum is σ = 2018484. Its totient is φ = 2012800.

The previous prime is 2015633. The next prime is 2015669. The reversal of 2015641 is 1465102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 585225 + 1430416 = 765^2 + 1196^2 .

It is a cyclic number.

It is not a de Polignac number, because 2015641 - 2³ = 2015633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2015621) 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, 621 + ... + 2101.

It is an arithmetic number, because the mean of its divisors is an integer number (504621).

2^2015641 is an apocalyptic number.

It is an amenable number.

2015641 is a deficient number, since it is larger than the sum of its proper divisors (2843).

2015641 is a wasteful number, since it uses less digits than its factorization.

2015641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2842.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 2015641 is about 1419.7327213247. The cubic root of 2015641 is about 126.3196929197.

The spelling of 2015641 in words is "two million, fifteen thousand, six hundred forty-one".