870109 has 2 divisors, whose sum is σ = 870110. Its totient is φ = 870108.

The previous prime is 870097. The next prime is 870127. The reversal of 870109 is 901078.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 770884 + 99225 = 878^2 + 315^2 .

It is a cyclic number.

It is not a de Polignac number, because 870109 - 2⁹ = 869597 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (870169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435054 + 435055.

It is an arithmetic number, because the mean of its divisors is an integer number (435055).

2⁸⁷⁰¹⁰⁹ is an apocalyptic number.

It is an amenable number.

870109 is a deficient number, since it is larger than the sum of its proper divisors (1).

870109 is an equidigital number, since it uses as much as digits as its factorization.

870109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 870109 is about 932.7963336120. The cubic root of 870109 is about 95.4680137390.

It can be divided in two parts, 870 and 109, that multiplied together give a triangular number (94830 = T₄₃₅).

The spelling of 870109 in words is "eight hundred seventy thousand, one hundred nine".