136651639 has 2 divisors, whose sum is σ = 136651640. Its totient is φ = 136651638.

The previous prime is 136651637. The next prime is 136651657. The reversal of 136651639 is 936156631.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 136651639 - 2¹ = 136651637 is a prime.

Together with 136651637, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136651633) 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, 68325819 + 68325820.

It is an arithmetic number, because the mean of its divisors is an integer number (68325820).

Almost surely, 2^136651639 is an apocalyptic number.

136651639 is a deficient number, since it is larger than the sum of its proper divisors (1).

136651639 is an equidigital number, since it uses as much as digits as its factorization.

136651639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 40.

The square root of 136651639 is about 11689.8091943367. The cubic root of 136651639 is about 515.0763565422.

The spelling of 136651639 in words is "one hundred thirty-six million, six hundred fifty-one thousand, six hundred thirty-nine".