135423551 has 4 divisors (see below), whose sum is σ = 135446832. Its totient is φ = 135400272.

The previous prime is 135423539. The next prime is 135423569. The reversal of 135423551 is 155324531.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 155324531 = 3019 ⋅51449.

It is a cyclic number.

It is not a de Polignac number, because 135423551 - 2²² = 131229247 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 (135423571) 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, 5435 + ... + 17331.

It is an arithmetic number, because the mean of its divisors is an integer number (33861708).

Almost surely, 2^135423551 is an apocalyptic number.

135423551 is a deficient number, since it is larger than the sum of its proper divisors (23281).

135423551 is a wasteful number, since it uses less digits than its factorization.

135423551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23280.

The product of its digits is 9000, while the sum is 29.

The square root of 135423551 is about 11637.1624977913. The cubic root of 135423551 is about 513.5287143014.

The spelling of 135423551 in words is "one hundred thirty-five million, four hundred twenty-three thousand, five hundred fifty-one".