135721739 has 2 divisors, whose sum is σ = 135721740. Its totient is φ = 135721738.

The previous prime is 135721697. The next prime is 135721757. The reversal of 135721739 is 937127531.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 135721739 - 2⁸ = 135721483 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (135721039) 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, 67860869 + 67860870.

It is an arithmetic number, because the mean of its divisors is an integer number (67860870).

Almost surely, 2^135721739 is an apocalyptic number.

135721739 is a deficient number, since it is larger than the sum of its proper divisors (1).

135721739 is an equidigital number, since it uses as much as digits as its factorization.

135721739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39690, while the sum is 38.

The square root of 135721739 is about 11649.9673390100. The cubic root of 135721739 is about 513.9053495467.

The spelling of 135721739 in words is "one hundred thirty-five million, seven hundred twenty-one thousand, seven hundred thirty-nine".