869608409 has 4 divisors (see below), whose sum is σ = 879379380. Its totient is φ = 859837440.

The previous prime is 869608387. The next prime is 869608417. The reversal of 869608409 is 904806968.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 576240025 + 293368384 = 24005^2 + 17128^2 .

It is a cyclic number.

It is not a de Polignac number, because 869608409 - 2²⁴ = 852831193 is a prime.

It is a super-2 number, since 2×869608409² = 1512437570007022562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (869608609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4885352 + ... + 4885529.

It is an arithmetic number, because the mean of its divisors is an integer number (219844845).

Almost surely, 2^869608409 is an apocalyptic number.

869608409 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

It is an amenable number.

869608409 is a deficient number, since it is larger than the sum of its proper divisors (9770971).

869608409 is an equidigital number, since it uses as much as digits as its factorization.

869608409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9770970.

The product of its (nonzero) digits is 746496, while the sum is 50.

The square root of 869608409 is about 29489.1235712423. The cubic root of 869608409 is about 954.4970201162.

The spelling of 869608409 in words is "eight hundred sixty-nine million, six hundred eight thousand, four hundred nine".