2507521 has 4 divisors (see below), whose sum is σ = 2524500. Its totient is φ = 2490544.

The previous prime is 2507489. The next prime is 2507567. The reversal of 2507521 is 1257052.

2507521 is nontrivially palindromic in base 6.

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 148225 + 2359296 = 385^2 + 1536^2 .

It is a cyclic number.

It is not a de Polignac number, because 2507521 - 2⁵ = 2507489 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2507492 and 2507501.

It is not an unprimeable number, because it can be changed into a prime (2507581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8266 + ... + 8563.

It is an arithmetic number, because the mean of its divisors is an integer number (631125).

2^2507521 is an apocalyptic number.

It is an amenable number.

2507521 is a deficient number, since it is larger than the sum of its proper divisors (16979).

2507521 is a wasteful number, since it uses less digits than its factorization.

2507521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16978.

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 2507521 is about 1583.5153930417. The cubic root of 2507521 is about 135.8568454747.

The spelling of 2507521 in words is "two million, five hundred seven thousand, five hundred twenty-one".