135642139 has 2 divisors, whose sum is σ = 135642140. Its totient is φ = 135642138.

The previous prime is 135642097. The next prime is 135642151. The reversal of 135642139 is 931246531.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 135642139 - 2⁷ = 135642011 is a prime.

It is not a weakly prime, because it can be changed into another prime (135642179) 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, 67821069 + 67821070.

It is an arithmetic number, because the mean of its divisors is an integer number (67821070).

Almost surely, 2^135642139 is an apocalyptic number.

135642139 is a deficient number, since it is larger than the sum of its proper divisors (1).

135642139 is an equidigital number, since it uses as much as digits as its factorization.

135642139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 34.

The square root of 135642139 is about 11646.5505193598. The cubic root of 135642139 is about 513.8048624129.

The spelling of 135642139 in words is "one hundred thirty-five million, six hundred forty-two thousand, one hundred thirty-nine".