136404561 has 16 divisors (see below), whose sum is σ = 185010048. Its totient is φ = 89376000.

The previous prime is 136404497. The next prime is 136404571. The reversal of 136404561 is 165404631.

It is not a de Polignac number, because 136404561 - 2⁶ = 136404497 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (136404571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84615 + ... + 86211.

It is an arithmetic number, because the mean of its divisors is an integer number (11563128).

Almost surely, 2^136404561 is an apocalyptic number.

It is an amenable number.

136404561 is a deficient number, since it is larger than the sum of its proper divisors (48605487).

136404561 is a wasteful number, since it uses less digits than its factorization.

136404561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2072.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 136404561 is about 11679.2363192120. The cubic root of 136404561 is about 514.7657350340.

The spelling of 136404561 in words is "one hundred thirty-six million, four hundred four thousand, five hundred sixty-one".