135311999 has 4 divisors (see below), whose sum is σ = 139977960. Its totient is φ = 130646040.

The previous prime is 135311989. The next prime is 135312029. The reversal of 135311999 is 999113531.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 135311999 - 2²⁴ = 118534783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135311989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2332937 + ... + 2332994.

It is an arithmetic number, because the mean of its divisors is an integer number (34994490).

Almost surely, 2^135311999 is an apocalyptic number.

135311999 is a deficient number, since it is larger than the sum of its proper divisors (4665961).

135311999 is an equidigital number, since it uses as much as digits as its factorization.

135311999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4665960.

The product of its digits is 32805, while the sum is 41.

The square root of 135311999 is about 11632.3685894146. The cubic root of 135311999 is about 513.3876731235.

The spelling of 135311999 in words is "one hundred thirty-five million, three hundred eleven thousand, nine hundred ninety-nine".