134840681 has 4 divisors (see below), whose sum is σ = 134880852. Its totient is φ = 134800512.

The previous prime is 134840659. The next prime is 134840689. The reversal of 134840681 is 186048431.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29593600 + 105247081 = 5440^2 + 10259^2 .

It is a cyclic number.

It is not a de Polignac number, because 134840681 - 2¹⁰ = 134839657 is a prime.

It is a super-2 number, since 2×134840681² = 36364018505087522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (134840689) 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, 14540 + ... + 21933.

It is an arithmetic number, because the mean of its divisors is an integer number (33720213).

Almost surely, 2^134840681 is an apocalyptic number.

It is an amenable number.

134840681 is a deficient number, since it is larger than the sum of its proper divisors (40171).

134840681 is an equidigital number, since it uses as much as digits as its factorization.

134840681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40170.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 134840681 is about 11612.0920165145. The cubic root of 134840681 is about 512.7909033383.

The spelling of 134840681 in words is "one hundred thirty-four million, eight hundred forty thousand, six hundred eighty-one".