136375781 has 2 divisors, whose sum is σ = 136375782. Its totient is φ = 136375780.

The previous prime is 136375769. The next prime is 136375783. The reversal of 136375781 is 187573631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115132900 + 21242881 = 10730^2 + 4609^2 .

It is a cyclic number.

It is not a de Polignac number, because 136375781 - 2¹⁰ = 136374757 is a prime.

It is a super-2 number, since 2×136375781² = 37196707286719922, which contains 22 as substring.

Together with 136375783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136375783) 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, 68187890 + 68187891.

It is an arithmetic number, because the mean of its divisors is an integer number (68187891).

Almost surely, 2^136375781 is an apocalyptic number.

It is an amenable number.

136375781 is a deficient number, since it is larger than the sum of its proper divisors (1).

136375781 is an equidigital number, since it uses as much as digits as its factorization.

136375781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 41.

The square root of 136375781 is about 11678.0041531077. The cubic root of 136375781 is about 514.7295290112.

The spelling of 136375781 in words is "one hundred thirty-six million, three hundred seventy-five thousand, seven hundred eighty-one".