135523969 has 4 divisors (see below), whose sum is σ = 154884544. Its totient is φ = 116163396.

The previous prime is 135523967. The next prime is 135524023. The reversal of 135523969 is 969325531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 135523969 - 2¹ = 135523967 is a prime.

It is a super-2 number, since 2×135523969² = 36733492347025922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135523961) 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, 9680277 + ... + 9680290.

It is an arithmetic number, because the mean of its divisors is an integer number (38721136).

Almost surely, 2^135523969 is an apocalyptic number.

It is an amenable number.

135523969 is a deficient number, since it is larger than the sum of its proper divisors (19360575).

135523969 is an equidigital number, since it uses as much as digits as its factorization.

135523969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19360574.

The product of its digits is 218700, while the sum is 43.

The square root of 135523969 is about 11641.4762380035. The cubic root of 135523969 is about 513.6556119381.

The spelling of 135523969 in words is "one hundred thirty-five million, five hundred twenty-three thousand, nine hundred sixty-nine".