1215322513 has 2 divisors, whose sum is σ = 1215322514. Its totient is φ = 1215322512.

The previous prime is 1215322499. The next prime is 1215322529. The reversal of 1215322513 is 3152235121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1207771009 + 7551504 = 34753^2 + 2748^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215322513 is a prime.

It is not a weakly prime, because it can be changed into another prime (1215322583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607661256 + 607661257.

It is an arithmetic number, because the mean of its divisors is an integer number (607661257).

Almost surely, 2^1215322513 is an apocalyptic number.

It is an amenable number.

1215322513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215322513 is an equidigital number, since it uses as much as digits as its factorization.

1215322513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 25.

The square root of 1215322513 is about 34861.4760588246. The cubic root of 1215322513 is about 1067.1623981655.

Adding to 1215322513 its reverse (3152235121), we get a palindrome (4367557634).

The spelling of 1215322513 in words is "one billion, two hundred fifteen million, three hundred twenty-two thousand, five hundred thirteen".