136678889 has 2 divisors, whose sum is σ = 136678890. Its totient is φ = 136678888.

The previous prime is 136678873. The next prime is 136678901. The reversal of 136678889 is 988876631.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69438889 + 67240000 = 8333^2 + 8200^2 .

It is an emirp because it is prime and its reverse (988876631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136678889 - 2⁴ = 136678873 is a prime.

It is a super-2 number, since 2×136678889² = 37362237396548642, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (136678859) 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, 68339444 + 68339445.

It is an arithmetic number, because the mean of its divisors is an integer number (68339445).

Almost surely, 2^136678889 is an apocalyptic number.

It is an amenable number.

136678889 is a deficient number, since it is larger than the sum of its proper divisors (1).

136678889 is an equidigital number, since it uses as much as digits as its factorization.

136678889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3483648, while the sum is 56.

The square root of 136678889 is about 11690.9746813514. The cubic root of 136678889 is about 515.1105917648.

The spelling of 136678889 in words is "one hundred thirty-six million, six hundred seventy-eight thousand, eight hundred eighty-nine".