870491 has 2 divisors, whose sum is σ = 870492. Its totient is φ = 870490.

The previous prime is 870479. The next prime is 870497. The reversal of 870491 is 194078.

870491 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 is a cyclic number.

It is not a de Polignac number, because 870491 - 2¹⁰ = 869467 is a prime.

It is not a weakly prime, because it can be changed into another prime (870497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435245 + 435246.

It is an arithmetic number, because the mean of its divisors is an integer number (435246).

2⁸⁷⁰⁴⁹¹ is an apocalyptic number.

870491 is a deficient number, since it is larger than the sum of its proper divisors (1).

870491 is an equidigital number, since it uses as much as digits as its factorization.

870491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 870491 is about 933.0010718107. The cubic root of 870491 is about 95.4819826577.

The spelling of 870491 in words is "eight hundred seventy thousand, four hundred ninety-one".