136809331 has 4 divisors (see below), whose sum is σ = 137255272. Its totient is φ = 136363392.

The previous prime is 136809311. The next prime is 136809341. The reversal of 136809331 is 133908631.

136809331 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.

It is a cyclic number.

It is not a de Polignac number, because 136809331 - 2²³ = 128420723 is a prime.

It is a super-2 number, since 2×136809331² = 37433586097335122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136809311) 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, 222510 + ... + 223123.

It is an arithmetic number, because the mean of its divisors is an integer number (34313818).

Almost surely, 2^136809331 is an apocalyptic number.

136809331 is a deficient number, since it is larger than the sum of its proper divisors (445941).

136809331 is an equidigital number, since it uses as much as digits as its factorization.

136809331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445940.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 136809331 is about 11696.5520988025. The cubic root of 136809331 is about 515.2744080701.

The spelling of 136809331 in words is "one hundred thirty-six million, eight hundred nine thousand, three hundred thirty-one".