136309381 has 8 divisors (see below), whose sum is σ = 146893824. Its totient is φ = 125739120.

The previous prime is 136309373. The next prime is 136309399. The reversal of 136309381 is 183903631.

136309381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 136309381 - 2³ = 136309373 is a prime.

It is a super-2 number, since 2×136309381² = 37160494697206322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136309321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24960 + ... + 29926.

It is an arithmetic number, because the mean of its divisors is an integer number (18361728).

Almost surely, 2^136309381 is an apocalyptic number.

It is an amenable number.

136309381 is a deficient number, since it is larger than the sum of its proper divisors (10584443).

136309381 is a wasteful number, since it uses less digits than its factorization.

136309381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7091.

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

The square root of 136309381 is about 11675.1608554229. The cubic root of 136309381 is about 514.6459765677.

The spelling of 136309381 in words is "one hundred thirty-six million, three hundred nine thousand, three hundred eighty-one".