136216561 has 16 divisors (see below), whose sum is σ = 152388544. Its totient is φ = 120947904.

The previous prime is 136216543. The next prime is 136216589. The reversal of 136216561 is 165612631.

It is a cyclic number.

It is not a de Polignac number, because 136216561 - 2¹⁵ = 136183793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136216541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35635 + ... + 39271.

It is an arithmetic number, because the mean of its divisors is an integer number (9524284).

Almost surely, 2^136216561 is an apocalyptic number.

It is an amenable number.

136216561 is a deficient number, since it is larger than the sum of its proper divisors (16171983).

136216561 is a wasteful number, since it uses less digits than its factorization.

136216561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3760.

The product of its digits is 6480, while the sum is 31.

The square root of 136216561 is about 11671.1850726479. The cubic root of 136216561 is about 514.5291338232.

The spelling of 136216561 in words is "one hundred thirty-six million, two hundred sixteen thousand, five hundred sixty-one".