13531121999 has 2 divisors, whose sum is σ = 13531122000. Its totient is φ = 13531121998.

The previous prime is 13531121987. The next prime is 13531122029. The reversal of 13531121999 is 99912113531.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13531121999 - 2⁴ = 13531121983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13531121959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6765560999 + 6765561000.

It is an arithmetic number, because the mean of its divisors is an integer number (6765561000).

Almost surely, 2^13531121999 is an apocalyptic number.

13531121999 is a deficient number, since it is larger than the sum of its proper divisors (1).

13531121999 is an equidigital number, since it uses as much as digits as its factorization.

13531121999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 65610, while the sum is 44.

The spelling of 13531121999 in words is "thirteen billion, five hundred thirty-one million, one hundred twenty-one thousand, nine hundred ninety-nine".