136591381 has 2 divisors, whose sum is σ = 136591382. Its totient is φ = 136591380.

The previous prime is 136591373. The next prime is 136591391. The reversal of 136591381 is 183195631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134768881 + 1822500 = 11609^2 + 1350^2 .

It is an emirp because it is prime and its reverse (183195631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136591381 - 2³ = 136591373 is a prime.

It is a super-2 number, since 2×136591381² = 37314410726974322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 136591381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136591391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68295690 + 68295691.

It is an arithmetic number, because the mean of its divisors is an integer number (68295691).

Almost surely, 2^136591381 is an apocalyptic number.

It is an amenable number.

136591381 is a deficient number, since it is larger than the sum of its proper divisors (1).

136591381 is an equidigital number, since it uses as much as digits as its factorization.

136591381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 37.

The square root of 136591381 is about 11687.2315370236. The cubic root of 136591381 is about 515.0006359373. Note that the first 3 decimals are identical.

The spelling of 136591381 in words is "one hundred thirty-six million, five hundred ninety-one thousand, three hundred eighty-one".