1315425509 has 4 divisors (see below), whose sum is σ = 1347509100. Its totient is φ = 1283341920.

The previous prime is 1315425493. The next prime is 1315425521. The reversal of 1315425509 is 9055245131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9055245131 = 19 ⋅476591849.

It can be written as a sum of positive squares in 2 ways, for example, as 689325025 + 626100484 = 26255^2 + 25022^2 .

It is a cyclic number.

It is not a de Polignac number, because 1315425509 - 2⁴ = 1315425493 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1315425109) 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, 16041734 + ... + 16041815.

It is an arithmetic number, because the mean of its divisors is an integer number (336877275).

Almost surely, 2^1315425509 is an apocalyptic number.

It is an amenable number.

1315425509 is a deficient number, since it is larger than the sum of its proper divisors (32083591).

1315425509 is an equidigital number, since it uses as much as digits as its factorization.

1315425509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32083590.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 1315425509 is about 36268.7952515658. The cubic root of 1315425509 is about 1095.6926621179.

The spelling of 1315425509 in words is "one billion, three hundred fifteen million, four hundred twenty-five thousand, five hundred nine".