135969949 has 4 divisors (see below), whose sum is σ = 136293340. Its totient is φ = 135646560.

The previous prime is 135969943. The next prime is 135969959. The reversal of 135969949 is 949969531.

135969949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7601049 + 128368900 = 2757^2 + 11330^2 .

It is a cyclic number.

It is not a de Polignac number, because 135969949 - 2³ = 135969941 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 135969949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135969941) 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, 161064 + ... + 161905.

It is an arithmetic number, because the mean of its divisors is an integer number (34073335).

Almost surely, 2^135969949 is an apocalyptic number.

It is an amenable number.

135969949 is a deficient number, since it is larger than the sum of its proper divisors (323391).

135969949 is an equidigital number, since it uses as much as digits as its factorization.

135969949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323390.

The product of its digits is 2361960, while the sum is 55.

The square root of 135969949 is about 11660.6152925135. The cubic root of 135969949 is about 514.2184380949.

The spelling of 135969949 in words is "one hundred thirty-five million, nine hundred sixty-nine thousand, nine hundred forty-nine".