13431523509 has 12 divisors (see below), whose sum is σ = 20244615456. Its totient is φ = 8565029352.

The previous prime is 13431523493. The next prime is 13431523517. The reversal of 13431523509 is 90532513431.

13431523509 is a `hidden beast` number, since 134 + 3 + 15 + 2 + 3 + 509 = 666.

It is not a de Polignac number, because 13431523509 - 2⁴ = 13431523493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13431533509) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32443087 + ... + 32443500.

It is an arithmetic number, because the mean of its divisors is an integer number (1687051288).

Almost surely, 2^13431523509 is an apocalyptic number.

It is an amenable number.

13431523509 is a deficient number, since it is larger than the sum of its proper divisors (6813091947).

13431523509 is a wasteful number, since it uses less digits than its factorization.

13431523509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64886616 (or 64886613 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The spelling of 13431523509 in words is "thirteen billion, four hundred thirty-one million, five hundred twenty-three thousand, five hundred nine".