870641 has 2 divisors, whose sum is σ = 870642. Its totient is φ = 870640.

The previous prime is 870629. The next prime is 870643. The reversal of 870641 is 146078.

870641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 461041 + 409600 = 679^2 + 640^2 .

It is a cyclic number.

It is not a de Polignac number, because 870641 - 2⁶ = 870577 is a prime.

Together with 870643, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₆₉₁₄₆ and since 870641 and 69146 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 870641.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (870643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435320 + 435321.

It is an arithmetic number, because the mean of its divisors is an integer number (435321).

2⁸⁷⁰⁶⁴¹ is an apocalyptic number.

It is an amenable number.

870641 is a deficient number, since it is larger than the sum of its proper divisors (1).

870641 is an equidigital number, since it uses as much as digits as its factorization.

870641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 870641 is about 933.0814541078. The cubic root of 870641 is about 95.4874667177.

The spelling of 870641 in words is "eight hundred seventy thousand, six hundred forty-one".