870691 has 2 divisors, whose sum is σ = 870692. Its totient is φ = 870690.

The previous prime is 870679. The next prime is 870703. The reversal of 870691 is 196078.

It is a balanced prime because it is at equal distance from previous prime (870679) and next prime (870703).

It is a cyclic number.

It is not a de Polignac number, because 870691 - 2¹⁵ = 837923 is a prime.

It is not a weakly prime, because it can be changed into another prime (870601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435345 + 435346.

It is an arithmetic number, because the mean of its divisors is an integer number (435346).

2⁸⁷⁰⁶⁹¹ is an apocalyptic number.

870691 is a deficient number, since it is larger than the sum of its proper divisors (1).

870691 is an equidigital number, since it uses as much as digits as its factorization.

870691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 870691 is about 933.1082466681. The cubic root of 870691 is about 95.4892945978.

The spelling of 870691 in words is "eight hundred seventy thousand, six hundred ninety-one".