2499561 has 27 divisors (see below), whose sum is σ = 3963063. Its totient is φ = 1517760.

The previous prime is 2499551. The next prime is 2499577. The reversal of 2499561 is 1659942.

The square root of 2499561 is 1581.

It is a perfect power (a square), and thus also a powerful number.

2499561 is a `hidden beast` number, since 2 + 4 + 99 + 561 = 666.

2499561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1946025 + 553536 = 1395^2 + 744^2 .

It is not a de Polignac number, because 2499561 - 2¹¹ = 2497513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2499521) 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 26 ways as a sum of consecutive naturals, for example, 80616 + ... + 80646.

2^2499561 is an apocalyptic number.

2499561 is the 1581-st square number.

2499561 is the 791-st centered octagonal number.

It is an amenable number.

2499561 is a deficient number, since it is larger than the sum of its proper divisors (1463502).

2499561 is a wasteful number, since it uses less digits than its factorization.

2499561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102 (or 51 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The cubic root of 2499561 is about 135.7129361691.

Multiplying 2499561 by its sum of digits (36), we get a square (89984196 = 9486²).

The spelling of 2499561 in words is "two million, four hundred ninety-nine thousand, five hundred sixty-one".