7521217 has 4 divisors (see below), whose sum is σ = 8204976. Its totient is φ = 6837460.

The previous prime is 7521209. The next prime is 7521221. The reversal of 7521217 is 7121257.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7521217 - 2³ = 7521209 is a prime.

It is a super-2 number, since 2×7521217² = 113137410322178, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7521191 and 7521200.

It is not an unprimeable number, because it can be changed into a prime (7521247) 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, 341863 + ... + 341884.

It is an arithmetic number, because the mean of its divisors is an integer number (2051244).

Almost surely, 2^7521217 is an apocalyptic number.

It is an amenable number.

7521217 is a deficient number, since it is larger than the sum of its proper divisors (683759).

7521217 is a wasteful number, since it uses less digits than its factorization.

7521217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683758.

The product of its digits is 980, while the sum is 25.

The square root of 7521217 is about 2742.4837283018. The cubic root of 7521217 is about 195.9277899345.

The spelling of 7521217 in words is "seven million, five hundred twenty-one thousand, two hundred seventeen".