875521 has 2 divisors, whose sum is σ = 875522. Its totient is φ = 875520.
The previous prime is 875519. The next prime is 875543. The reversal of 875521 is 125578.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 874225 + 1296 = 935^2 + 36^2 .
It is a cyclic number.
It is not a de Polignac number, because 875521 - 21 = 875519 is a prime.
Together with 875519, it forms a pair of twin primes.
It is a nialpdrome in base 10.
It is a self number, because there is not a number n which added to its sum of digits gives 875521.
It is not a weakly prime, because it can be changed into another prime (875591) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 437760 + 437761.
It is an arithmetic number, because the mean of its divisors is an integer number (437761).
It is a Proth number, since it is equal to 855 ⋅ 210 + 1 and 855 < 210.
2875521 is an apocalyptic number.
It is an amenable number.
875521 is a deficient number, since it is larger than the sum of its proper divisors (1).
875521 is an equidigital number, since it uses as much as digits as its factorization.
875521 is an evil number, because the sum of its binary digits is even.
The product of its digits is 2800, while the sum is 28.
The square root of 875521 is about 935.6927914652. The cubic root of 875521 is about 95.6655389368.
The spelling of 875521 in words is "eight hundred seventy-five thousand, five hundred twenty-one".
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