136465561 has 4 divisors (see below), whose sum is σ = 141171300. Its totient is φ = 131759824.

The previous prime is 136465559. The next prime is 136465577. The reversal of 136465561 is 165564631.

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 102313225 + 34152336 = 10115^2 + 5844^2 .

It is a cyclic number.

It is not a de Polignac number, because 136465561 - 2¹ = 136465559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 136465561.

It is not an unprimeable number, because it can be changed into a prime (136465501) 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, 2352826 + ... + 2352883.

It is an arithmetic number, because the mean of its divisors is an integer number (35292825).

Almost surely, 2^136465561 is an apocalyptic number.

It is an amenable number.

136465561 is a deficient number, since it is larger than the sum of its proper divisors (4705739).

136465561 is an equidigital number, since it uses as much as digits as its factorization.

136465561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4705738.

The product of its digits is 64800, while the sum is 37.

The square root of 136465561 is about 11681.8474994326. The cubic root of 136465561 is about 514.8424578600.

It can be divided in two parts, 136465 and 561, that added together give a triangular number (137026 = T₅₂₃).

The spelling of 136465561 in words is "one hundred thirty-six million, four hundred sixty-five thousand, five hundred sixty-one".