75006521 has 4 divisors (see below), whose sum is σ = 75023844. Its totient is φ = 74989200.

The previous prime is 75006517. The next prime is 75006527. The reversal of 75006521 is 12560057.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3857296 + 71149225 = 1964^2 + 8435^2 .

It is a cyclic number.

It is not a de Polignac number, because 75006521 - 2² = 75006517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75006527) 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, 4211 + ... + 12951.

It is an arithmetic number, because the mean of its divisors is an integer number (18755961).

Almost surely, 2^75006521 is an apocalyptic number.

It is an amenable number.

75006521 is a deficient number, since it is larger than the sum of its proper divisors (17323).

75006521 is an equidigital number, since it uses as much as digits as its factorization.

75006521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17322.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 75006521 is about 8660.6305197716. The cubic root of 75006521 is about 421.7285545731.

Adding to 75006521 its reverse (12560057), we get a palindrome (87566578).

The spelling of 75006521 in words is "seventy-five million, six thousand, five hundred twenty-one".