136881009 has 20 divisors (see below), whose sum is σ = 207074560. Its totient is φ = 90094680.

The previous prime is 136881007. The next prime is 136881023. The reversal of 136881009 is 900188631.

It is not a de Polignac number, because 136881009 - 2¹ = 136881007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136881007) 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 19 ways as a sum of consecutive naturals, for example, 4297 + ... + 17094.

It is an arithmetic number, because the mean of its divisors is an integer number (10353728).

Almost surely, 2^136881009 is an apocalyptic number.

It is an amenable number.

136881009 is a deficient number, since it is larger than the sum of its proper divisors (70193551).

136881009 is an equidigital number, since it uses as much as digits as its factorization.

136881009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21482 (or 21473 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 136881009 is about 11699.6157629214. The cubic root of 136881009 is about 515.3643809553.

The spelling of 136881009 in words is "one hundred thirty-six million, eight hundred eighty-one thousand, nine".