135344561 has 4 divisors (see below), whose sum is σ = 147648624. Its totient is φ = 123040500.

The previous prime is 135344549. The next prime is 135344579. The reversal of 135344561 is 165443531.

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 de Polignac number, because none of the positive numbers 2^k-135344561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (135344501) 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, 6152015 + ... + 6152036.

It is an arithmetic number, because the mean of its divisors is an integer number (36912156).

Almost surely, 2^135344561 is an apocalyptic number.

135344561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

135344561 is a deficient number, since it is larger than the sum of its proper divisors (12304063).

135344561 is a wasteful number, since it uses less digits than its factorization.

135344561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12304062.

The product of its digits is 21600, while the sum is 32.

The square root of 135344561 is about 11633.7681341859. The cubic root of 135344561 is about 513.4288510155.

The spelling of 135344561 in words is "one hundred thirty-five million, three hundred forty-four thousand, five hundred sixty-one".