870983209 has 2 divisors, whose sum is σ = 870983210. Its totient is φ = 870983208.

The previous prime is 870983173. The next prime is 870983233. The reversal of 870983209 is 902389078.

870983209 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., 869365225 + 1617984 = 29485^2 + 1272^2 .

It is a cyclic number.

It is not a de Polignac number, because 870983209 - 2⁷ = 870983081 is a prime.

It is a super-2 number, since 2×870983209² = 1517223500719875362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (870983249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435491604 + 435491605.

It is an arithmetic number, because the mean of its divisors is an integer number (435491605).

Almost surely, 2^870983209 is an apocalyptic number.

It is an amenable number.

870983209 is a deficient number, since it is larger than the sum of its proper divisors (1).

870983209 is an equidigital number, since it uses as much as digits as its factorization.

870983209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 870983209 is about 29512.4246547111. The cubic root of 870983209 is about 954.9997565856. Note that the first 3 decimals are identical.

The spelling of 870983209 in words is "eight hundred seventy million, nine hundred eighty-three thousand, two hundred nine".