135591389 has 4 divisors (see below), whose sum is σ = 136933980. Its totient is φ = 134248800.

The previous prime is 135591367. The next prime is 135591397. The reversal of 135591389 is 983195531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 131285764 + 4305625 = 11458^2 + 2075^2 .

It is a cyclic number.

It is not a de Polignac number, because 135591389 - 2¹² = 135587293 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 (135591319) 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, 671144 + ... + 671345.

It is an arithmetic number, because the mean of its divisors is an integer number (34233495).

Almost surely, 2^135591389 is an apocalyptic number.

It is an amenable number.

135591389 is a deficient number, since it is larger than the sum of its proper divisors (1342591).

135591389 is a wasteful number, since it uses less digits than its factorization.

135591389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1342590.

The product of its digits is 145800, while the sum is 44.

The square root of 135591389 is about 11644.3715588262. The cubic root of 135591389 is about 513.7407750291.

The spelling of 135591389 in words is "one hundred thirty-five million, five hundred ninety-one thousand, three hundred eighty-nine".