1315521315 has 12 divisors (see below), whose sum is σ = 2280237024. Its totient is φ = 701611344.

The previous prime is 1315521313. The next prime is 1315521323. The reversal of 1315521315 is 5131255131.

1315521315 is a `hidden beast` number, since 131 + 5 + 521 + 3 + 1 + 5 = 666.

It is not a de Polignac number, because 1315521315 - 2¹ = 1315521313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1315521313) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14616859 + ... + 14616948.

It is an arithmetic number, because the mean of its divisors is an integer number (190019752).

Almost surely, 2^1315521315 is an apocalyptic number.

1315521315 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1315521315 is a deficient number, since it is larger than the sum of its proper divisors (964715709).

1315521315 is a wasteful number, since it uses less digits than its factorization.

1315521315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29233818 (or 29233815 counting only the distinct ones).

The product of its digits is 2250, while the sum is 27.

The square root of 1315521315 is about 36270.1160047773. The cubic root of 1315521315 is about 1095.7192622261.

Adding to 1315521315 its reverse (5131255131), we get a palindrome (6446776446).

The spelling of 1315521315 in words is "one billion, three hundred fifteen million, five hundred twenty-one thousand, three hundred fifteen".