135571623 has 16 divisors (see below), whose sum is σ = 198343296. Its totient is φ = 81686240.

The previous prime is 135571613. The next prime is 135571679. The reversal of 135571623 is 326175531.

It is a cyclic number.

It is not a de Polignac number, because 135571623 - 2¹³ = 135563431 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135571603) 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 15 ways as a sum of consecutive naturals, for example, 6165 + ... + 17582.

It is an arithmetic number, because the mean of its divisors is an integer number (12396456).

Almost surely, 2^135571623 is an apocalyptic number.

135571623 is a deficient number, since it is larger than the sum of its proper divisors (62771673).

135571623 is a wasteful number, since it uses less digits than its factorization.

135571623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23934.

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

The square root of 135571623 is about 11643.5227916640. The cubic root of 135571623 is about 513.7158100867.

The spelling of 135571623 in words is "one hundred thirty-five million, five hundred seventy-one thousand, six hundred twenty-three".