136531817 has 2 divisors, whose sum is σ = 136531818. Its totient is φ = 136531816.

The previous prime is 136531783. The next prime is 136531823. The reversal of 136531817 is 718135631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98327056 + 38204761 = 9916^2 + 6181^2 .

It is an emirp because it is prime and its reverse (718135631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136531817 - 2¹⁴ = 136515433 is a prime.

It is a Chen prime.

It is equal to p_7727183 and since 136531817 and 7727183 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (136531877) 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, 68265908 + 68265909.

It is an arithmetic number, because the mean of its divisors is an integer number (68265909).

Almost surely, 2^136531817 is an apocalyptic number.

It is an amenable number.

136531817 is a deficient number, since it is larger than the sum of its proper divisors (1).

136531817 is an equidigital number, since it uses as much as digits as its factorization.

136531817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 35.

The square root of 136531817 is about 11684.6830081094. The cubic root of 136531817 is about 514.9257655277.

The spelling of 136531817 in words is "one hundred thirty-six million, five hundred thirty-one thousand, eight hundred seventeen".