136768381 has 4 divisors (see below), whose sum is σ = 136796992. Its totient is φ = 136739772.

The previous prime is 136768369. The next prime is 136768393. The reversal of 136768381 is 183867631.

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 an interprime number because it is at equal distance from previous prime (136768369) and next prime (136768393).

It is a cyclic number.

It is not a de Polignac number, because 136768381 - 2⁷ = 136768253 is a prime.

It is a super-2 number, since 2×136768381² = 37411180082722322, 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 (136768361) 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, 5205 + ... + 17338.

It is an arithmetic number, because the mean of its divisors is an integer number (34199248).

Almost surely, 2^136768381 is an apocalyptic number.

It is an amenable number.

136768381 is a deficient number, since it is larger than the sum of its proper divisors (28611).

136768381 is an equidigital number, since it uses as much as digits as its factorization.

136768381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28610.

The product of its digits is 145152, while the sum is 43.

The square root of 136768381 is about 11694.8014519273. The cubic root of 136768381 is about 515.2229920044. Note that the first 3 decimals are identical.

The spelling of 136768381 in words is "one hundred thirty-six million, seven hundred sixty-eight thousand, three hundred eighty-one".