136995561 has 12 divisors (see below), whose sum is σ = 198002688. Its totient is φ = 91274904.

The previous prime is 136995539. The next prime is 136995563. The reversal of 136995561 is 165599631.

136995561 is a `hidden beast` number, since 1 + 3 + 6 + 99 + 556 + 1 = 666.

It is not a de Polignac number, because 136995561 - 2⁹ = 136995049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (136995563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15736 + ... + 22838.

It is an arithmetic number, because the mean of its divisors is an integer number (16500224).

Almost surely, 2^136995561 is an apocalyptic number.

It is an amenable number.

136995561 is a deficient number, since it is larger than the sum of its proper divisors (61007127).

136995561 is a wasteful number, since it uses less digits than its factorization.

136995561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9252 (or 9249 counting only the distinct ones).

The product of its digits is 218700, while the sum is 45.

The square root of 136995561 is about 11704.5102845014. The cubic root of 136995561 is about 515.5081056889.

The spelling of 136995561 in words is "one hundred thirty-six million, nine hundred ninety-five thousand, five hundred sixty-one".