135968669 has 8 divisors (see below), whose sum is σ = 147478968. Its totient is φ = 124848640.

The previous prime is 135968647. The next prime is 135968681. The reversal of 135968669 is 966869531.

It can be written as a sum of positive squares in 4 ways, for example, as 525625 + 135443044 = 725^2 + 11638^2 .

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-135968669 is a prime.

It is a super-2 number, since 2×135968669² = 36974957899263122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 135968669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135968639) 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, 96842 + ... + 98235.

It is an arithmetic number, because the mean of its divisors is an integer number (18434871).

Almost surely, 2^135968669 is an apocalyptic number.

It is an amenable number.

135968669 is a deficient number, since it is larger than the sum of its proper divisors (11510299).

135968669 is a wasteful number, since it uses less digits than its factorization.

135968669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195135.

The product of its digits is 2099520, while the sum is 53.

The square root of 135968669 is about 11660.5604067729. The cubic root of 135968669 is about 514.2168244989.

The spelling of 135968669 in words is "one hundred thirty-five million, nine hundred sixty-eight thousand, six hundred sixty-nine".