135520023 has 8 divisors (see below), whose sum is σ = 181469808. Its totient is φ = 89958464.

The previous prime is 135520009. The next prime is 135520057. The reversal of 135520023 is 320025531.

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 135520023 - 2²¹ = 133422871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135520123) 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, 96240 + ... + 97637.

It is an arithmetic number, because the mean of its divisors is an integer number (22683726).

Almost surely, 2^135520023 is an apocalyptic number.

135520023 is a deficient number, since it is larger than the sum of its proper divisors (45949785).

135520023 is a wasteful number, since it uses less digits than its factorization.

135520023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194113.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 135520023 is about 11641.3067565458. The cubic root of 135520023 is about 513.6506265845.

Adding to 135520023 its reverse (320025531), we get a palindrome (455545554).

The spelling of 135520023 in words is "one hundred thirty-five million, five hundred twenty thousand, twenty-three".