135969401 has 4 divisors (see below), whose sum is σ = 135993204. Its totient is φ = 135945600.

The previous prime is 135969347. The next prime is 135969403. The reversal of 135969401 is 104969531.

135969401 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, and also an emirpimes, since its reverse is a distinct semiprime: 104969531 = 29 ⋅3619639.

It can be written as a sum of positive squares in 2 ways, for example, as 17682025 + 118287376 = 4205^2 + 10876^2 .

It is a cyclic number.

It is not a de Polignac number, because 135969401 - 2¹⁴ = 135953017 is a prime.

It is a deceptive number, since it divides R_135969400.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (135969403) 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, 2381 + ... + 16661.

It is an arithmetic number, because the mean of its divisors is an integer number (33998301).

It is a Poulet number, since it divides 2^135969400-1.

Almost surely, 2^135969401 is an apocalyptic number.

135969401 is the 9521-st pentagonal number.

It is an amenable number.

135969401 is a deficient number, since it is larger than the sum of its proper divisors (23803).

135969401 is an equidigital number, since it uses as much as digits as its factorization.

135969401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23802.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 135969401 is about 11660.5917945874. The cubic root of 135969401 is about 514.2177472754.

The spelling of 135969401 in words is "one hundred thirty-five million, nine hundred sixty-nine thousand, four hundred one".