135489391 has 4 divisors (see below), whose sum is σ = 138372192. Its totient is φ = 132606592.

The previous prime is 135489377. The next prime is 135489401. The reversal of 135489391 is 193984531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193984531 = 13 ⋅14921887.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135489391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135489091) 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, 1441330 + ... + 1441423.

It is an arithmetic number, because the mean of its divisors is an integer number (34593048).

Almost surely, 2^135489391 is an apocalyptic number.

135489391 is a deficient number, since it is larger than the sum of its proper divisors (2882801).

135489391 is an equidigital number, since it uses as much as digits as its factorization.

135489391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2882800.

The product of its digits is 116640, while the sum is 43.

The square root of 135489391 is about 11639.9910223333. The cubic root of 135489391 is about 513.6119230009.

The spelling of 135489391 in words is "one hundred thirty-five million, four hundred eighty-nine thousand, three hundred ninety-one".