135613257 has 8 divisors (see below), whose sum is σ = 194726784. Its totient is φ = 83454288.

The previous prime is 135613253. The next prime is 135613277. The reversal of 135613257 is 752316531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 135613257 - 2² = 135613253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (135613253) 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 7 ways as a sum of consecutive naturals, for example, 1738593 + ... + 1738670.

It is an arithmetic number, because the mean of its divisors is an integer number (24340848).

Almost surely, 2^135613257 is an apocalyptic number.

It is an amenable number.

135613257 is a deficient number, since it is larger than the sum of its proper divisors (59113527).

135613257 is a wasteful number, since it uses less digits than its factorization.

135613257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3477279.

The product of its digits is 18900, while the sum is 33.

The square root of 135613257 is about 11645.3105153963. The cubic root of 135613257 is about 513.7683920222.

Adding to 135613257 its reverse (752316531), we get a palindrome (887929788).

The spelling of 135613257 in words is "one hundred thirty-five million, six hundred thirteen thousand, two hundred fifty-seven".