875209121 has 4 divisors (see below), whose sum is σ = 875583744. Its totient is φ = 874834500.

The previous prime is 875209117. The next prime is 875209123. The reversal of 875209121 is 121902578.

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 875209121 - 2² = 875209117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (875209123) 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, 183785 + ... + 188486.

It is an arithmetic number, because the mean of its divisors is an integer number (218895936).

Almost surely, 2^875209121 is an apocalyptic number.

It is an amenable number.

875209121 is a deficient number, since it is larger than the sum of its proper divisors (374623).

875209121 is a wasteful number, since it uses less digits than its factorization.

875209121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374622.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 875209121 is about 29583.9334943817. The cubic root of 875209121 is about 956.5417822847.

The spelling of 875209121 in words is "eight hundred seventy-five million, two hundred nine thousand, one hundred twenty-one".