69131609 has 4 divisors (see below), whose sum is σ = 69844404. Its totient is φ = 68418816.

The previous prime is 69131603. The next prime is 69131611. The reversal of 69131609 is 90613196.

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 56550400 + 12581209 = 7520^2 + 3547^2 .

It is a cyclic number.

It is not a de Polignac number, because 69131609 - 2⁴ = 69131593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69131603) 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, 356252 + ... + 356445.

It is an arithmetic number, because the mean of its divisors is an integer number (17461101).

Almost surely, 2^69131609 is an apocalyptic number.

It is an amenable number.

69131609 is a deficient number, since it is larger than the sum of its proper divisors (712795).

69131609 is an equidigital number, since it uses as much as digits as its factorization.

69131609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712794.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 69131609 is about 8314.5420198589. The cubic root of 69131609 is about 410.4172017389.

The spelling of 69131609 in words is "sixty-nine million, one hundred thirty-one thousand, six hundred nine".