135643623 has 16 divisors (see below), whose sum is σ = 182472960. Its totient is φ = 89626176.

The previous prime is 135643619. The next prime is 135643637. The reversal of 135643623 is 326346531.

It is not a de Polignac number, because 135643623 - 2² = 135643619 is a prime.

It is a super-2 number, since 2×135643623² = 36798384921132258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135643523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 278286 + ... + 278772.

It is an arithmetic number, because the mean of its divisors is an integer number (11404560).

Almost surely, 2^135643623 is an apocalyptic number.

135643623 is a deficient number, since it is larger than the sum of its proper divisors (46829337).

135643623 is a wasteful number, since it uses less digits than its factorization.

135643623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126.

The product of its digits is 38880, while the sum is 33.

The square root of 135643623 is about 11646.6142290367. The cubic root of 135643623 is about 513.8067361758.

The spelling of 135643623 in words is "one hundred thirty-five million, six hundred forty-three thousand, six hundred twenty-three".