135671993509 has 32 divisors (see below), whose sum is σ = 149507792000. Its totient is φ = 123084479232.

The previous prime is 135671993423. The next prime is 135671993537. The reversal of 135671993509 is 905399176531.

It is not a de Polignac number, because 135671993509 - 2²¹ = 135669896357 is a prime.

It is a super-2 number, since 2×135671993509² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135671993539) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91115437 + ... + 91116925.

It is an arithmetic number, because the mean of its divisors is an integer number (4672118500).

Almost surely, 2^135671993509 is an apocalyptic number.

It is an amenable number.

135671993509 is a deficient number, since it is larger than the sum of its proper divisors (13835798491).

135671993509 is an equidigital number, since it uses as much as digits as its factorization.

135671993509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2214 (or 2188 counting only the distinct ones).

The product of its (nonzero) digits is 6889050, while the sum is 58.

The spelling of 135671993509 in words is "one hundred thirty-five billion, six hundred seventy-one million, nine hundred ninety-three thousand, five hundred nine".