1215520413013 has 2 divisors, whose sum is σ = 1215520413014. Its totient is φ = 1215520413012.

The previous prime is 1215520413011. The next prime is 1215520413061. The reversal of 1215520413013 is 3103140255121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 907831651204 + 307688761809 = 952802^2 + 554697^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215520413013 - 2¹ = 1215520413011 is a prime.

Together with 1215520413011, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215520413011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607760206506 + 607760206507.

It is an arithmetic number, because the mean of its divisors is an integer number (607760206507).

Almost surely, 2^{1215520413013} is an apocalyptic number.

It is an amenable number.

1215520413013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215520413013 is an equidigital number, since it uses as much as digits as its factorization.

1215520413013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 1215520413013 its reverse (3103140255121), we get a palindrome (4318660668134).

The spelling of 1215520413013 in words is "one trillion, two hundred fifteen billion, five hundred twenty million, four hundred thirteen thousand, thirteen".