136581418 has 4 divisors (see below), whose sum is σ = 204872130. Its totient is φ = 68290708.

The previous prime is 136581409. The next prime is 136581421. The reversal of 136581418 is 814185631.

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

It can be written as a sum of positive squares in only one way, i.e., 133564249 + 3017169 = 11557^2 + 1737^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34145353 + ... + 34145356.

Almost surely, 2^136581418 is an apocalyptic number.

136581418 is a deficient number, since it is larger than the sum of its proper divisors (68290712).

136581418 is an equidigital number, since it uses as much as digits as its factorization.

136581418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68290711.

The product of its digits is 23040, while the sum is 37.

The square root of 136581418 is about 11686.8052948614. The cubic root of 136581418 is about 514.9881142197.

The spelling of 136581418 in words is "one hundred thirty-six million, five hundred eighty-one thousand, four hundred eighteen".