875921521 has 4 divisors (see below), whose sum is σ = 877337200. Its totient is φ = 874505844.

The previous prime is 875921491. The next prime is 875921551. The reversal of 875921521 is 125129578.

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 (875921491) and next prime (875921551).

It is a cyclic number.

It is not a de Polignac number, because 875921521 - 2⁷ = 875921393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (875921551) 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, 706911 + ... + 708148.

It is an arithmetic number, because the mean of its divisors is an integer number (219334300).

Almost surely, 2^875921521 is an apocalyptic number.

It is an amenable number.

875921521 is a deficient number, since it is larger than the sum of its proper divisors (1415679).

875921521 is a wasteful number, since it uses less digits than its factorization.

875921521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1415678.

The product of its digits is 50400, while the sum is 40.

The square root of 875921521 is about 29595.9713643597. The cubic root of 875921521 is about 956.8012462005.

The spelling of 875921521 in words is "eight hundred seventy-five million, nine hundred twenty-one thousand, five hundred twenty-one".