135872523 has 12 divisors (see below), whose sum is σ = 204793680. Its totient is φ = 86643216.

The previous prime is 135872519. The next prime is 135872531. The reversal of 135872523 is 325278531.

It is a happy number.

135872523 is a `hidden beast` number, since 13 + 58 + 72 + 523 = 666.

It is not a de Polignac number, because 135872523 - 2² = 135872519 is a prime.

It is a super-2 number, since 2×135872523² = 36922685012771058, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (135872543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 327988 + ... + 328401.

It is an arithmetic number, because the mean of its divisors is an integer number (17066140).

Almost surely, 2^135872523 is an apocalyptic number.

135872523 is a deficient number, since it is larger than the sum of its proper divisors (68921157).

135872523 is a wasteful number, since it uses less digits than its factorization.

135872523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656418 (or 656415 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 135872523 is about 11656.4369770526. The cubic root of 135872523 is about 514.0955917938.

It can be divided in two parts, 13587 and 2523, that added together give a triangular number (16110 = T₁₇₉).

The spelling of 135872523 in words is "one hundred thirty-five million, eight hundred seventy-two thousand, five hundred twenty-three".