135599999 has 4 divisors (see below), whose sum is σ = 136100640. Its totient is φ = 135099360.

The previous prime is 135599987. The next prime is 135600013. The reversal of 135599999 is 999995531.

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 135599999 - 2¹² = 135595903 is a prime.

It is a Duffinian number.

135599999 is a modest number, since divided by 99999 gives 1355 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135599929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249914 + ... + 250455.

It is an arithmetic number, because the mean of its divisors is an integer number (34025160).

Almost surely, 2^135599999 is an apocalyptic number.

135599999 is a deficient number, since it is larger than the sum of its proper divisors (500641).

135599999 is an equidigital number, since it uses as much as digits as its factorization.

135599999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500640.

The product of its digits is 4428675, while the sum is 59.

The square root of 135599999 is about 11644.7412594699. The cubic root of 135599999 is about 513.7516489115.

The spelling of 135599999 in words is "one hundred thirty-five million, five hundred ninety-nine thousand, nine hundred ninety-nine".