136881839 has 2 divisors, whose sum is σ = 136881840. Its totient is φ = 136881838.

The previous prime is 136881817. The next prime is 136881847. The reversal of 136881839 is 938188631.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 136881839 - 2¹² = 136877743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 136881793 and 136881802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136881889) 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, 68440919 + 68440920.

It is an arithmetic number, because the mean of its divisors is an integer number (68440920).

Almost surely, 2^136881839 is an apocalyptic number.

136881839 is a deficient number, since it is larger than the sum of its proper divisors (1).

136881839 is an equidigital number, since it uses as much as digits as its factorization.

136881839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 47.

The square root of 136881839 is about 11699.6512341180. The cubic root of 136881839 is about 515.3654226181.

The spelling of 136881839 in words is "one hundred thirty-six million, eight hundred eighty-one thousand, eight hundred thirty-nine".