135402523 has 4 divisors (see below), whose sum is σ = 135793080. Its totient is φ = 135011968.

The previous prime is 135402521. The next prime is 135402539. The reversal of 135402523 is 325204531.

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 135402523 - 2¹ = 135402521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135402521) 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, 194758 + ... + 195451.

It is an arithmetic number, because the mean of its divisors is an integer number (33948270).

Almost surely, 2^135402523 is an apocalyptic number.

135402523 is a deficient number, since it is larger than the sum of its proper divisors (390557).

135402523 is an equidigital number, since it uses as much as digits as its factorization.

135402523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390556.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 135402523 is about 11636.2589778674. The cubic root of 135402523 is about 513.5021333985.

The spelling of 135402523 in words is "one hundred thirty-five million, four hundred two thousand, five hundred twenty-three".