135711257 has 4 divisors (see below), whose sum is σ = 148048656. Its totient is φ = 123373860.

The previous prime is 135711253. The next prime is 135711259. The reversal of 135711257 is 752117531.

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 135711257 - 2² = 135711253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135711253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6168683 + ... + 6168704.

It is an arithmetic number, because the mean of its divisors is an integer number (37012164).

Almost surely, 2^135711257 is an apocalyptic number.

It is an amenable number.

135711257 is a deficient number, since it is larger than the sum of its proper divisors (12337399).

135711257 is a wasteful number, since it uses less digits than its factorization.

135711257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12337398.

The product of its digits is 7350, while the sum is 32.

The square root of 135711257 is about 11649.5174578177. The cubic root of 135711257 is about 513.8921193042.

Adding to 135711257 its reverse (752117531), we get a palindrome (887828788).

The spelling of 135711257 in words is "one hundred thirty-five million, seven hundred eleven thousand, two hundred fifty-seven".