135237613 has 4 divisors (see below), whose sum is σ = 154557280.
Its totient is φ = 115917948.
The previous prime is 135237607. The next prime is 135237629. The reversal of 135237613 is 316732531.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 135237613 - 25 = 135237581 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (135237673) 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, 9659823 + ... + 9659836.
It is an arithmetic number, because the mean of its divisors is an integer number (38639320).
Almost surely, 2135237613 is an apocalyptic number.
It is an amenable number.
135237613 is a deficient number, since it is larger than the sum of its proper divisors (19319667).
135237613 is an equidigital number, since it uses as much as digits as its factorization.
135237613 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 19319666.
The product of its digits is 11340, while the sum is 31.
The square root of 135237613 is about 11629.1707786927.
The cubic root of 135237613 is about 513.2935798285.
The spelling of 135237613 in words is "one hundred thirty-five million, two hundred thirty-seven thousand, six hundred thirteen".