136444881 has 4 divisors (see below), whose sum is σ = 181926512. Its totient is φ = 90963252.

The previous prime is 136444879. The next prime is 136444939. The reversal of 136444881 is 188444631.

136444881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is not a de Polignac number, because 136444881 - 2¹ = 136444879 is a prime.

It is a super-2 number, since 2×136444881² = 37234411102208322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136444831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22740811 + ... + 22740816.

It is an arithmetic number, because the mean of its divisors is an integer number (45481628).

Almost surely, 2^136444881 is an apocalyptic number.

It is an amenable number.

136444881 is a deficient number, since it is larger than the sum of its proper divisors (45481631).

136444881 is an equidigital number, since it uses as much as digits as its factorization.

136444881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45481630.

The product of its digits is 73728, while the sum is 39.

The square root of 136444881 is about 11680.9623319314. The cubic root of 136444881 is about 514.8164501263.

The spelling of 136444881 in words is "one hundred thirty-six million, four hundred forty-four thousand, eight hundred eighty-one".