135523565 has 4 divisors (see below), whose sum is σ = 162628284. Its totient is φ = 108418848.

The previous prime is 135523547. The next prime is 135523601. The reversal of 135523565 is 565325531.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18472804 + 117050761 = 4298^2 + 10819^2 .

It is a cyclic number.

It is not a de Polignac number, because 135523565 - 2¹⁴ = 135507181 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13552352 + ... + 13552361.

It is an arithmetic number, because the mean of its divisors is an integer number (40657071).

Almost surely, 2^135523565 is an apocalyptic number.

It is an amenable number.

135523565 is a deficient number, since it is larger than the sum of its proper divisors (27104719).

135523565 is an equidigital number, since it uses as much as digits as its factorization.

135523565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27104718.

The product of its digits is 67500, while the sum is 35.

The square root of 135523565 is about 11641.4588862393. The cubic root of 135523565 is about 513.6551015313.

The spelling of 135523565 in words is "one hundred thirty-five million, five hundred twenty-three thousand, five hundred sixty-five".