1321536613 has 2 divisors, whose sum is σ = 1321536614. Its totient is φ = 1321536612.

The previous prime is 1321536589. The next prime is 1321536679. The reversal of 1321536613 is 3166351231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1143927684 + 177608929 = 33822^2 + 13327^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321536613 - 2¹³ = 1321528421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321536413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660768306 + 660768307.

It is an arithmetic number, because the mean of its divisors is an integer number (660768307).

Almost surely, 2^1321536613 is an apocalyptic number.

It is an amenable number.

1321536613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321536613 is an equidigital number, since it uses as much as digits as its factorization.

1321536613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 31.

The square root of 1321536613 is about 36352.9450388823. The cubic root of 1321536613 is about 1097.3868032546.

Adding to 1321536613 its reverse (3166351231), we get a palindrome (4487887844).

The spelling of 1321536613 in words is "one billion, three hundred twenty-one million, five hundred thirty-six thousand, six hundred thirteen".