1315234321561 has 2 divisors, whose sum is σ = 1315234321562. Its totient is φ = 1315234321560.

The previous prime is 1315234321523. The next prime is 1315234321567. The reversal of 1315234321561 is 1651234325131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1244438415936 + 70795905625 = 1115544^2 + 266075^2 .

It is a cyclic number.

It is not a de Polignac number, because 1315234321561 - 2⁷ = 1315234321433 is a prime.

It is a super-2 number, since 2×1315234321561² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1315234321561.

It is not a weakly prime, because it can be changed into another prime (1315234321567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657617160780 + 657617160781.

It is an arithmetic number, because the mean of its divisors is an integer number (657617160781).

Almost surely, 2^{1315234321561} is an apocalyptic number.

It is an amenable number.

1315234321561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315234321561 is an equidigital number, since it uses as much as digits as its factorization.

1315234321561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 37.

Adding to 1315234321561 its reverse (1651234325131), we get a palindrome (2966468646692).

The spelling of 1315234321561 in words is "one trillion, three hundred fifteen billion, two hundred thirty-four million, three hundred twenty-one thousand, five hundred sixty-one".