1315261603 has 4 divisors (see below), whose sum is σ = 1316183440. Its totient is φ = 1314339768.

The previous prime is 1315261589. The next prime is 1315261609. The reversal of 1315261603 is 3061625131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3061625131 = 31 ⋅98762101.

It is a cyclic number.

It is not a de Polignac number, because 1315261603 - 2²¹ = 1313164451 is a prime.

It is a super-2 number, since 2×1315261603² = 3459826168652259218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1315261609) 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, 458775 + ... + 461632.

It is an arithmetic number, because the mean of its divisors is an integer number (329045860).

Almost surely, 2^1315261603 is an apocalyptic number.

1315261603 is a deficient number, since it is larger than the sum of its proper divisors (921837).

1315261603 is an equidigital number, since it uses as much as digits as its factorization.

1315261603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921836.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 1315261603 is about 36266.5355803391. The cubic root of 1315261603 is about 1095.6471513535.

Adding to 1315261603 its reverse (3061625131), we get a palindrome (4376886734).

The spelling of 1315261603 in words is "one billion, three hundred fifteen million, two hundred sixty-one thousand, six hundred three".