1309643469 has 6 divisors (see below), whose sum is σ = 1891707246. Its totient is φ = 873095640.

The previous prime is 1309643459. The next prime is 1309643497. The reversal of 1309643469 is 9643469031.

It can be written as a sum of positive squares in only one way, i.e., 1275561225 + 34082244 = 35715^2 + 5838^2 .

It is not a de Polignac number, because 1309643469 - 2¹³ = 1309635277 is a prime.

It is a super-2 number, since 2×1309643469² = 3430332031788707922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309643449) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72757962 + ... + 72757979.

It is an arithmetic number, because the mean of its divisors is an integer number (315284541).

Almost surely, 2^1309643469 is an apocalyptic number.

It is an amenable number.

1309643469 is a deficient number, since it is larger than the sum of its proper divisors (582063777).

1309643469 is a wasteful number, since it uses less digits than its factorization.

1309643469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145515947 (or 145515944 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 45.

The square root of 1309643469 is about 36188.9965182789. The cubic root of 1309643469 is about 1094.0849075781.

It can be divided in two parts, 13096 and 43469, that added together give a palindrome (56565).

The spelling of 1309643469 in words is "one billion, three hundred nine million, six hundred forty-three thousand, four hundred sixty-nine".