875621 has 2 divisors, whose sum is σ = 875622. Its totient is φ = 875620.

The previous prime is 875617. The next prime is 875627. The reversal of 875621 is 126578.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 792100 + 83521 = 890^2 + 289^2 .

It is a cyclic number.

It is not a de Polignac number, because 875621 - 2² = 875617 is a prime.

It is an Ulam number.

It is a plaindrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 875621.

It is not a weakly prime, because it can be changed into another prime (875627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 437810 + 437811.

It is an arithmetic number, because the mean of its divisors is an integer number (437811).

2⁸⁷⁵⁶²¹ is an apocalyptic number.

It is an amenable number.

875621 is a deficient number, since it is larger than the sum of its proper divisors (1).

875621 is an equidigital number, since it uses as much as digits as its factorization.

875621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 29.

The square root of 875621 is about 935.7462262815. The cubic root of 875621 is about 95.6691810309.

The spelling of 875621 in words is "eight hundred seventy-five thousand, six hundred twenty-one".