1315451209 has 4 divisors (see below), whose sum is σ = 1315808640. Its totient is φ = 1315093780.

The previous prime is 1315451191. The next prime is 1315451231. The reversal of 1315451209 is 9021545131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9021545131 = 3593 ⋅2510867.

It is a cyclic number.

It is not a de Polignac number, because 1315451209 - 2¹⁷ = 1315320137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1315451299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173137 + ... + 180574.

It is an arithmetic number, because the mean of its divisors is an integer number (328952160).

Almost surely, 2^1315451209 is an apocalyptic number.

It is an amenable number.

1315451209 is a deficient number, since it is larger than the sum of its proper divisors (357431).

1315451209 is an equidigital number, since it uses as much as digits as its factorization.

1315451209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357430.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1315451209 is about 36269.1495488935. The cubic root of 1315451209 is about 1095.6997977349.

The spelling of 1315451209 in words is "one billion, three hundred fifteen million, four hundred fifty-one thousand, two hundred nine".