136406891 has 2 divisors, whose sum is σ = 136406892. Its totient is φ = 136406890.

The previous prime is 136406873. The next prime is 136406903. The reversal of 136406891 is 198604631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 136406891 - 2²⁶ = 69298027 is a prime.

It is not a weakly prime, because it can be changed into another prime (136408891) 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, 68203445 + 68203446.

It is an arithmetic number, because the mean of its divisors is an integer number (68203446).

Almost surely, 2^136406891 is an apocalyptic number.

136406891 is a deficient number, since it is larger than the sum of its proper divisors (1).

136406891 is an equidigital number, since it uses as much as digits as its factorization.

136406891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 136406891 is about 11679.3360684587. The cubic root of 136406891 is about 514.7686660145.

The spelling of 136406891 in words is "one hundred thirty-six million, four hundred six thousand, eight hundred ninety-one".