13531322509 has 2 divisors, whose sum is σ = 13531322510. Its totient is φ = 13531322508.

The previous prime is 13531322471. The next prime is 13531322527. The reversal of 13531322509 is 90522313531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7131802500 + 6399520009 = 84450^2 + 79997^2 .

It is a cyclic number.

It is not a de Polignac number, because 13531322509 - 2¹³ = 13531314317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13531322009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6765661254 + 6765661255.

It is an arithmetic number, because the mean of its divisors is an integer number (6765661255).

Almost surely, 2^13531322509 is an apocalyptic number.

It is an amenable number.

13531322509 is a deficient number, since it is larger than the sum of its proper divisors (1).

13531322509 is an equidigital number, since it uses as much as digits as its factorization.

13531322509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24300, while the sum is 34.

The spelling of 13531322509 in words is "thirteen billion, five hundred thirty-one million, three hundred twenty-two thousand, five hundred nine".