2513561 has 4 divisors (see below), whose sum is σ = 2539572. Its totient is φ = 2487552.

The previous prime is 2513557. The next prime is 2513579. The reversal of 2513561 is 1653152.

2513561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1336336 + 1177225 = 1156^2 + 1085^2 .

It is a cyclic number.

It is not a de Polignac number, because 2513561 - 2² = 2513557 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2513551) 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, 12860 + ... + 13053.

It is an arithmetic number, because the mean of its divisors is an integer number (634893).

2^2513561 is an apocalyptic number.

It is an amenable number.

2513561 is a deficient number, since it is larger than the sum of its proper divisors (26011).

2513561 is an equidigital number, since it uses as much as digits as its factorization.

2513561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26010.

The product of its digits is 900, while the sum is 23.

The square root of 2513561 is about 1585.4213950871. The cubic root of 2513561 is about 135.9658398922.

The spelling of 2513561 in words is "two million, five hundred thirteen thousand, five hundred sixty-one".