136781219 has 4 divisors (see below), whose sum is σ = 138109296. Its totient is φ = 135453144.

The previous prime is 136781213. The next prime is 136781243. The reversal of 136781219 is 912187631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 912187631 = 29311 ⋅31121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136781219 is a prime.

It is a super-2 number, since 2×136781219² = 37418203742251922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136781213) 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 in 3 ways as a sum of consecutive naturals, for example, 663884 + ... + 664089.

It is an arithmetic number, because the mean of its divisors is an integer number (34527324).

Almost surely, 2^136781219 is an apocalyptic number.

136781219 is a deficient number, since it is larger than the sum of its proper divisors (1328077).

136781219 is a wasteful number, since it uses less digits than its factorization.

136781219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328076.

The product of its digits is 18144, while the sum is 38.

The square root of 136781219 is about 11695.3503154031. The cubic root of 136781219 is about 515.2391122650.

The spelling of 136781219 in words is "one hundred thirty-six million, seven hundred eighty-one thousand, two hundred nineteen".