135974842193 has 4 divisors (see below), whose sum is σ = 143973362340. Its totient is φ = 127976322048.

The previous prime is 135974842163. The next prime is 135974842271. The reversal of 135974842193 is 391248479531.

It is a happy number.

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 37207323664 + 98767518529 = 192892^2 + 314273^2 .

It is not a de Polignac number, because 135974842193 - 2³² = 131679874897 is a prime.

It is a super-2 number, since 2×135974842193² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (135974842163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3999260048 + ... + 3999260081.

It is an arithmetic number, because the mean of its divisors is an integer number (35993340585).

Almost surely, 2^135974842193 is an apocalyptic number.

It is an amenable number.

135974842193 is a deficient number, since it is larger than the sum of its proper divisors (7998520147).

135974842193 is an equidigital number, since it uses as much as digits as its factorization.

135974842193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7998520146.

The product of its digits is 6531840, while the sum is 56.

The spelling of 135974842193 in words is "one hundred thirty-five billion, nine hundred seventy-four million, eight hundred forty-two thousand, one hundred ninety-three".