858969409 has 2 divisors, whose sum is σ = 858969410. Its totient is φ = 858969408.

The previous prime is 858969403. The next prime is 858969437. The reversal of 858969409 is 904969858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 747202225 + 111767184 = 27335^2 + 10572^2 .

It is a cyclic number.

It is not a de Polignac number, because 858969409 - 2⁷ = 858969281 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (858969403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429484704 + 429484705.

It is an arithmetic number, because the mean of its divisors is an integer number (429484705).

Almost surely, 2^858969409 is an apocalyptic number.

It is an amenable number.

858969409 is a deficient number, since it is larger than the sum of its proper divisors (1).

858969409 is an equidigital number, since it uses as much as digits as its factorization.

858969409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5598720, while the sum is 58.

The square root of 858969409 is about 29308.1798991340. The cubic root of 858969409 is about 950.5885213952.

The spelling of 858969409 in words is "eight hundred fifty-eight million, nine hundred sixty-nine thousand, four hundred nine".