2561015 has 8 divisors (see below), whose sum is σ = 3084048. Its totient is φ = 2041600.

The previous prime is 2560997. The next prime is 2561017. The reversal of 2561015 is 5101652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2561015 - 2⁸ = 2560759 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1040 + ... + 2490.

It is an arithmetic number, because the mean of its divisors is an integer number (385506).

2^2561015 is an apocalyptic number.

2561015 is a deficient number, since it is larger than the sum of its proper divisors (523033).

2561015 is a wasteful number, since it uses less digits than its factorization.

2561015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1809.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 2561015 is about 1600.3171560663. The cubic root of 2561015 is about 136.8161527784.

Adding to 2561015 its reverse (5101652), we get a palindrome (7662667).

The spelling of 2561015 in words is "two million, five hundred sixty-one thousand, fifteen".