135988361 has 4 divisors (see below), whose sum is σ = 136013892. Its totient is φ = 135962832.

The previous prime is 135988297. The next prime is 135988373. The reversal of 135988361 is 163889531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 163889531 = 13 ⋅12606887.

It can be written as a sum of positive squares in 2 ways, for example, as 135862336 + 126025 = 11656^2 + 355^2 .

It is a cyclic number.

It is not a de Polignac number, because 135988361 - 2⁶ = 135988297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135988861) 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, 1406 + ... + 16551.

It is an arithmetic number, because the mean of its divisors is an integer number (34003473).

Almost surely, 2^135988361 is an apocalyptic number.

It is an amenable number.

135988361 is a deficient number, since it is larger than the sum of its proper divisors (25531).

135988361 is an equidigital number, since it uses as much as digits as its factorization.

135988361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25530.

The product of its digits is 155520, while the sum is 44.

The square root of 135988361 is about 11661.4047610054. The cubic root of 135988361 is about 514.2416475433.

The spelling of 135988361 in words is "one hundred thirty-five million, nine hundred eighty-eight thousand, three hundred sixty-one".