136968639 has 4 divisors (see below), whose sum is σ = 182624856. Its totient is φ = 91312424.

The previous prime is 136968619. The next prime is 136968647. The reversal of 136968639 is 936869631.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 136968639 - 2¹⁶ = 136903103 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 136968591 and 136968600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136968619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22828104 + ... + 22828109.

It is an arithmetic number, because the mean of its divisors is an integer number (45656214).

Almost surely, 2^136968639 is an apocalyptic number.

136968639 is a deficient number, since it is larger than the sum of its proper divisors (45656217).

136968639 is an equidigital number, since it uses as much as digits as its factorization.

136968639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45656216.

The product of its digits is 1259712, while the sum is 51.

The square root of 136968639 is about 11703.3601585186. The cubic root of 136968639 is about 515.4743347201.

The spelling of 136968639 in words is "one hundred thirty-six million, nine hundred sixty-eight thousand, six hundred thirty-nine".