135653561 has 4 divisors (see below), whose sum is σ = 140331300. Its totient is φ = 130975824.

The previous prime is 135653549. The next prime is 135653579. The reversal of 135653561 is 165356531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165356531 = 191 ⋅865741.

It can be written as a sum of positive squares in 2 ways, for example, as 52113961 + 83539600 = 7219^2 + 9140^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135653561 is a prime.

It is a super-2 number, since 2×135653561² = 36803777223961442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135659561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2338826 + ... + 2338883.

It is an arithmetic number, because the mean of its divisors is an integer number (35082825).

Almost surely, 2^135653561 is an apocalyptic number.

It is an amenable number.

135653561 is a deficient number, since it is larger than the sum of its proper divisors (4677739).

135653561 is an equidigital number, since it uses as much as digits as its factorization.

135653561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4677738.

The product of its digits is 40500, while the sum is 35.

The square root of 135653561 is about 11647.0408688216. The cubic root of 135653561 is about 513.8192839746.

The spelling of 135653561 in words is "one hundred thirty-five million, six hundred fifty-three thousand, five hundred sixty-one".