135256551 has 16 divisors (see below), whose sum is σ = 188818560. Its totient is φ = 86008160.

The previous prime is 135256547. The next prime is 135256567. The reversal of 135256551 is 155652531.

It is a cyclic number.

It is not a de Polignac number, because 135256551 - 2² = 135256547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135256501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2145 + ... + 16586.

It is an arithmetic number, because the mean of its divisors is an integer number (11801160).

Almost surely, 2^135256551 is an apocalyptic number.

135256551 is a deficient number, since it is larger than the sum of its proper divisors (53562009).

135256551 is a wasteful number, since it uses less digits than its factorization.

135256551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18846.

The product of its digits is 22500, while the sum is 33.

The square root of 135256551 is about 11629.9849956911. The cubic root of 135256551 is about 513.3175384001.

It can be divided in two parts, 135 and 256551, that added together give a triangular number (256686 = T₇₁₆).

The spelling of 135256551 in words is "one hundred thirty-five million, two hundred fifty-six thousand, five hundred fifty-one".