136670381 has 8 divisors (see below), whose sum is σ = 139978104. Its totient is φ = 133401600.

The previous prime is 136670371. The next prime is 136670423. The reversal of 136670381 is 183076631.

It can be written as a sum of positive squares in 4 ways, for example, as 24098281 + 112572100 = 4909^2 + 10610^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 136670381 - 2¹⁴ = 136653997 is a prime.

It is a super-2 number, since 2×136670381² = 37357586085370322, 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 (136670311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2570 + ... + 16731.

It is an arithmetic number, because the mean of its divisors is an integer number (17497263).

Almost surely, 2^136670381 is an apocalyptic number.

It is an amenable number.

136670381 is a deficient number, since it is larger than the sum of its proper divisors (3307723).

136670381 is an equidigital number, since it uses as much as digits as its factorization.

136670381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19471.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 136670381 is about 11690.6108052574. The cubic root of 136670381 is about 515.0999033259.

The spelling of 136670381 in words is "one hundred thirty-six million, six hundred seventy thousand, three hundred eighty-one".