7875121 has 4 divisors (see below), whose sum is σ = 7916544. Its totient is φ = 7833700.

The previous prime is 7875089. The next prime is 7875137. The reversal of 7875121 is 1215787.

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 7875121 - 2⁵ = 7875089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7875181) 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, 20425 + ... + 20806.

It is an arithmetic number, because the mean of its divisors is an integer number (1979136).

Almost surely, 2^7875121 is an apocalyptic number.

It is an amenable number.

7875121 is a deficient number, since it is larger than the sum of its proper divisors (41423).

7875121 is a wasteful number, since it uses less digits than its factorization.

7875121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41422.

The product of its digits is 3920, while the sum is 31.

The square root of 7875121 is about 2806.2645990712. The cubic root of 7875121 is about 198.9538793651.

The spelling of 7875121 in words is "seven million, eight hundred seventy-five thousand, one hundred twenty-one".