135983553 has 4 divisors (see below), whose sum is σ = 181311408. Its totient is φ = 90655700.

The previous prime is 135983539. The next prime is 135983557. The reversal of 135983553 is 355389531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 135983553 - 2⁴ = 135983537 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (135983557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22663923 + ... + 22663928.

It is an arithmetic number, because the mean of its divisors is an integer number (45327852).

Almost surely, 2^135983553 is an apocalyptic number.

It is an amenable number.

135983553 is a deficient number, since it is larger than the sum of its proper divisors (45327855).

135983553 is an equidigital number, since it uses as much as digits as its factorization.

135983553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45327854.

The product of its digits is 243000, while the sum is 42.

The square root of 135983553 is about 11661.1986090624. The cubic root of 135983553 is about 514.2355869683.

The spelling of 135983553 in words is "one hundred thirty-five million, nine hundred eighty-three thousand, five hundred fifty-three".