136378691 has 2 divisors, whose sum is σ = 136378692. Its totient is φ = 136378690.

The previous prime is 136378679. The next prime is 136378747. The reversal of 136378691 is 196873631.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136378691 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (136378601) 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, 68189345 + 68189346.

It is an arithmetic number, because the mean of its divisors is an integer number (68189346).

Almost surely, 2^136378691 is an apocalyptic number.

136378691 is a deficient number, since it is larger than the sum of its proper divisors (1).

136378691 is an equidigital number, since it uses as much as digits as its factorization.

136378691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 44.

The square root of 136378691 is about 11678.1287456510. The cubic root of 136378691 is about 514.7331901018.

The spelling of 136378691 in words is "one hundred thirty-six million, three hundred seventy-eight thousand, six hundred ninety-one".