75143521 has 8 divisors (see below), whose sum is σ = 77673600. Its totient is φ = 72655440.

The previous prime is 75143513. The next prime is 75143527. The reversal of 75143521 is 12534157.

It is a happy number.

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 75143521 - 2³ = 75143513 is a prime.

It is a super-3 number, since 3×75143521³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 75143521.

It is not an unprimeable number, because it can be changed into a prime (75143527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6841 + ... + 14038.

It is an arithmetic number, because the mean of its divisors is an integer number (9709200).

Almost surely, 2^75143521 is an apocalyptic number.

It is an amenable number.

75143521 is a deficient number, since it is larger than the sum of its proper divisors (2530079).

75143521 is a wasteful number, since it uses less digits than its factorization.

75143521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20999.

The product of its digits is 4200, while the sum is 28.

The square root of 75143521 is about 8668.5362662909. The cubic root of 75143521 is about 421.9851619110.

Adding to 75143521 its reverse (12534157), we get a palindrome (87677678).

The spelling of 75143521 in words is "seventy-five million, one hundred forty-three thousand, five hundred twenty-one".