136343681 has 2 divisors, whose sum is σ = 136343682. Its totient is φ = 136343680.

The previous prime is 136343659. The next prime is 136343687. The reversal of 136343681 is 186343631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121903681 + 14440000 = 11041^2 + 3800^2 .

It is a cyclic number.

It is not a de Polignac number, because 136343681 - 2⁶ = 136343617 is a prime.

It is a super-2 number, since 2×136343681² = 37179198697259522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (136343687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68171840 + 68171841.

It is an arithmetic number, because the mean of its divisors is an integer number (68171841).

Almost surely, 2^136343681 is an apocalyptic number.

It is an amenable number.

136343681 is a deficient number, since it is larger than the sum of its proper divisors (1).

136343681 is an equidigital number, since it uses as much as digits as its factorization.

136343681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 35.

The square root of 136343681 is about 11676.6296935374. The cubic root of 136343681 is about 514.6891403285.

The spelling of 136343681 in words is "one hundred thirty-six million, three hundred forty-three thousand, six hundred eighty-one".