136205881 has 4 divisors (see below), whose sum is σ = 155663872. Its totient is φ = 116747892.

The previous prime is 136205879. The next prime is 136205891. The reversal of 136205881 is 188502631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 188502631 = 181 ⋅1041451.

It is a cyclic number.

It is not a de Polignac number, because 136205881 - 2¹ = 136205879 is a prime.

It is a super-2 number, since 2×136205881² = 37104084037972322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (136205891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9728985 + ... + 9728998.

It is an arithmetic number, because the mean of its divisors is an integer number (38915968).

Almost surely, 2^136205881 is an apocalyptic number.

It is an amenable number.

136205881 is a deficient number, since it is larger than the sum of its proper divisors (19457991).

136205881 is an equidigital number, since it uses as much as digits as its factorization.

136205881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19457990.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 136205881 is about 11670.7275265940. The cubic root of 136205881 is about 514.5156863277.

The spelling of 136205881 in words is "one hundred thirty-six million, two hundred five thousand, eight hundred eighty-one".