136523381 has 2 divisors, whose sum is σ = 136523382. Its totient is φ = 136523380.

The previous prime is 136523369. The next prime is 136523441. The reversal of 136523381 is 183325631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105062500 + 31460881 = 10250^2 + 5609^2 .

It is a cyclic number.

It is not a de Polignac number, because 136523381 - 2²² = 132329077 is a prime.

It is a super-2 number, since 2×136523381² = 37277267119342322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136523281) 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 as a sum of consecutive naturals, namely, 68261690 + 68261691.

It is an arithmetic number, because the mean of its divisors is an integer number (68261691).

Almost surely, 2^136523381 is an apocalyptic number.

It is an amenable number.

136523381 is a deficient number, since it is larger than the sum of its proper divisors (1).

136523381 is an equidigital number, since it uses as much as digits as its factorization.

136523381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 32.

The square root of 136523381 is about 11684.3220171305. The cubic root of 136523381 is about 514.9151599333.

The spelling of 136523381 in words is "one hundred thirty-six million, five hundred twenty-three thousand, three hundred eighty-one".