135688499 has 8 divisors (see below), whose sum is σ = 136956720. Its totient is φ = 134424576.

The previous prime is 135688463. The next prime is 135688507. The reversal of 135688499 is 994886531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135688499 is a prime.

It is a super-2 number, since 2×135688499² = 36822737521746002, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135688499.

It is not an unprimeable number, because it can be changed into a prime (135688409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117107 + ... + 118259.

It is an arithmetic number, because the mean of its divisors is an integer number (17119590).

Almost surely, 2^135688499 is an apocalyptic number.

135688499 is a deficient number, since it is larger than the sum of its proper divisors (1268221).

135688499 is a wasteful number, since it uses less digits than its factorization.

135688499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2149.

The product of its digits is 1866240, while the sum is 53.

The square root of 135688499 is about 11648.5406382087. The cubic root of 135688499 is about 513.8633921106.

The spelling of 135688499 in words is "one hundred thirty-five million, six hundred eighty-eight thousand, four hundred ninety-nine".