135673591 has 8 divisors (see below), whose sum is σ = 137542160. Its totient is φ = 133818048.

The previous prime is 135673579. The next prime is 135673607. The reversal of 135673591 is 195376531.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 135673591 - 2⁷ = 135673463 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 (135673501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18715 + ... + 24931.

It is an arithmetic number, because the mean of its divisors is an integer number (17192770).

Almost surely, 2^135673591 is an apocalyptic number.

135673591 is a deficient number, since it is larger than the sum of its proper divisors (1868569).

135673591 is a wasteful number, since it uses less digits than its factorization.

135673591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6513.

The product of its digits is 85050, while the sum is 40.

The square root of 135673591 is about 11647.9007121455. The cubic root of 135673591 is about 513.8445721515.

It can be divided in two parts, 1356 and 73591, that added together give a palindrome (74947).

The spelling of 135673591 in words is "one hundred thirty-five million, six hundred seventy-three thousand, five hundred ninety-one".