75143121 has 4 divisors (see below), whose sum is σ = 100190832. Its totient is φ = 50095412.

The previous prime is 75143099. The next prime is 75143143. The reversal of 75143121 is 12134157.

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 an interprime number because it is at equal distance from previous prime (75143099) and next prime (75143143).

It is a cyclic number.

It is not a de Polignac number, because 75143121 - 2¹⁰ = 75142097 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 75143091 and 75143100.

It is not an unprimeable number, because it can be changed into a prime (75143171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12523851 + ... + 12523856.

It is an arithmetic number, because the mean of its divisors is an integer number (25047708).

Almost surely, 2^75143121 is an apocalyptic number.

It is an amenable number.

75143121 is a deficient number, since it is larger than the sum of its proper divisors (25047711).

75143121 is a wasteful number, since it uses less digits than its factorization.

75143121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25047710.

The product of its digits is 840, while the sum is 24.

The square root of 75143121 is about 8668.5131943142. The cubic root of 75143121 is about 421.9844131467.

Adding to 75143121 its reverse (12134157), we get a palindrome (87277278).

The spelling of 75143121 in words is "seventy-five million, one hundred forty-three thousand, one hundred twenty-one".