136335721 has 2 divisors, whose sum is σ = 136335722. Its totient is φ = 136335720.

The previous prime is 136335653. The next prime is 136335739. The reversal of 136335721 is 127533631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117072400 + 19263321 = 10820^2 + 4389^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136335721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (136335791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68167860 + 68167861.

It is an arithmetic number, because the mean of its divisors is an integer number (68167861).

Almost surely, 2^136335721 is an apocalyptic number.

It is an amenable number.

136335721 is a deficient number, since it is larger than the sum of its proper divisors (1).

136335721 is an equidigital number, since it uses as much as digits as its factorization.

136335721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11340, while the sum is 31.

The square root of 136335721 is about 11676.2888367837. The cubic root of 136335721 is about 514.6791239609.

The spelling of 136335721 in words is "one hundred thirty-six million, three hundred thirty-five thousand, seven hundred twenty-one".