13531321387 has 2 divisors, whose sum is σ = 13531321388. Its totient is φ = 13531321386.

The previous prime is 13531321357. The next prime is 13531321483. The reversal of 13531321387 is 78312313531.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13531321387 - 2⁷ = 13531321259 is a prime.

It is not a weakly prime, because it can be changed into another prime (13531321357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6765660693 + 6765660694.

It is an arithmetic number, because the mean of its divisors is an integer number (6765660694).

Almost surely, 2^13531321387 is an apocalyptic number.

13531321387 is a deficient number, since it is larger than the sum of its proper divisors (1).

13531321387 is an equidigital number, since it uses as much as digits as its factorization.

13531321387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 37.

The spelling of 13531321387 in words is "thirteen billion, five hundred thirty-one million, three hundred twenty-one thousand, three hundred eighty-seven".