136638787 has 2 divisors, whose sum is σ = 136638788. Its totient is φ = 136638786.

The previous prime is 136638769. The next prime is 136638851. The reversal of 136638787 is 787836631.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 136638787 - 2⁷ = 136638659 is a prime.

It is a super-2 number, since 2×136638787² = 37340316225662738, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 136638787.

It is not a weakly prime, because it can be changed into another prime (136638727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68319393 + 68319394.

It is an arithmetic number, because the mean of its divisors is an integer number (68319394).

Almost surely, 2^136638787 is an apocalyptic number.

136638787 is a deficient number, since it is larger than the sum of its proper divisors (1).

136638787 is an equidigital number, since it uses as much as digits as its factorization.

136638787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 49.

The square root of 136638787 is about 11689.2594718400. The cubic root of 136638787 is about 515.0602085010.

The spelling of 136638787 in words is "one hundred thirty-six million, six hundred thirty-eight thousand, seven hundred eighty-seven".