135423569 has 2 divisors, whose sum is σ = 135423570. Its totient is φ = 135423568.

The previous prime is 135423539. The next prime is 135423571. The reversal of 135423569 is 965324531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130530625 + 4892944 = 11425^2 + 2212^2 .

It is a cyclic number.

It is not a de Polignac number, because 135423569 - 2⁸ = 135423313 is a prime.

It is a super-2 number, since 2×135423569² = 36679086081395522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 135423571, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (135423539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67711784 + 67711785.

It is an arithmetic number, because the mean of its divisors is an integer number (67711785).

Almost surely, 2^135423569 is an apocalyptic number.

It is an amenable number.

135423569 is a deficient number, since it is larger than the sum of its proper divisors (1).

135423569 is an equidigital number, since it uses as much as digits as its factorization.

135423569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97200, while the sum is 38.

The square root of 135423569 is about 11637.1632711757. The cubic root of 135423569 is about 513.5287370535.

The spelling of 135423569 in words is "one hundred thirty-five million, four hundred twenty-three thousand, five hundred sixty-nine".