135551551 has 4 divisors (see below), whose sum is σ = 135590392. Its totient is φ = 135512712.

The previous prime is 135551543. The next prime is 135551573. The reversal of 135551551 is 155155531.

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

It is a cyclic number.

It is not a de Polignac number, because 135551551 - 2³ = 135551543 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 (135551501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13605 + ... + 21358.

It is an arithmetic number, because the mean of its divisors is an integer number (33897598).

Almost surely, 2^135551551 is an apocalyptic number.

135551551 is a deficient number, since it is larger than the sum of its proper divisors (38841).

135551551 is an equidigital number, since it uses as much as digits as its factorization.

135551551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38840.

The product of its digits is 9375, while the sum is 31.

The square root of 135551551 is about 11642.6608213071. The cubic root of 135551551 is about 513.6904561755.

The spelling of 135551551 in words is "one hundred thirty-five million, five hundred fifty-one thousand, five hundred fifty-one".