7521505 has 8 divisors (see below), whose sum is σ = 9066600. Its totient is φ = 5990016.

The previous prime is 7521467. The next prime is 7521533. The reversal of 7521505 is 5051257.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3972049 + 3549456 = 1993^2 + 1884^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 7521505 - 2⁹ = 7520993 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 7521505.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2140 + ... + 4429.

It is an arithmetic number, because the mean of its divisors is an integer number (1133325).

Almost surely, 2^7521505 is an apocalyptic number.

It is an amenable number.

7521505 is a deficient number, since it is larger than the sum of its proper divisors (1545095).

7521505 is a wasteful number, since it uses less digits than its factorization.

7521505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6803.

The product of its (nonzero) digits is 1750, while the sum is 25.

The square root of 7521505 is about 2742.5362349475. The cubic root of 7521505 is about 195.9302907037.

It can be divided in two parts, 752 and 1505, that multiplied together give a triangular number (1131760 = T₁₅₀₄).

The spelling of 7521505 in words is "seven million, five hundred twenty-one thousand, five hundred five".