136386491 has 2 divisors, whose sum is σ = 136386492. Its totient is φ = 136386490.

The previous prime is 136386487. The next prime is 136386493. The reversal of 136386491 is 194683631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 136386491 - 2² = 136386487 is a prime.

Together with 136386493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (136386493) 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, 68193245 + 68193246.

It is an arithmetic number, because the mean of its divisors is an integer number (68193246).

Almost surely, 2^136386491 is an apocalyptic number.

136386491 is a deficient number, since it is larger than the sum of its proper divisors (1).

136386491 is an equidigital number, since it uses as much as digits as its factorization.

136386491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 41.

The square root of 136386491 is about 11678.4626984890. The cubic root of 136386491 is about 514.7430030775.

The spelling of 136386491 in words is "one hundred thirty-six million, three hundred eighty-six thousand, four hundred ninety-one".