1315667209 has 4 divisors (see below), whose sum is σ = 1319571604. Its totient is φ = 1311762816.

The previous prime is 1315667203. The next prime is 1315667251. The reversal of 1315667209 is 9027665131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9027665131 = 193 ⋅46775467.

It can be written as a sum of positive squares in 2 ways, for example, as 239630400 + 1076036809 = 15480^2 + 32803^2 .

It is a cyclic number.

It is not a de Polignac number, because 1315667209 - 2¹³ = 1315659017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1315667203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1951692 + ... + 1952365.

It is an arithmetic number, because the mean of its divisors is an integer number (329892901).

Almost surely, 2^1315667209 is an apocalyptic number.

It is an amenable number.

1315667209 is a deficient number, since it is larger than the sum of its proper divisors (3904395).

1315667209 is an equidigital number, since it uses as much as digits as its factorization.

1315667209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3904394.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 1315667209 is about 36272.1271639809. The cubic root of 1315667209 is about 1095.7597665633.

The spelling of 1315667209 in words is "one billion, three hundred fifteen million, six hundred sixty-seven thousand, two hundred nine".