136438281 has 12 divisors (see below), whose sum is σ = 225231552. Its totient is φ = 77964696.

The previous prime is 136438279. The next prime is 136438307. The reversal of 136438281 is 182834631.

136438281 is a `hidden beast` number, since 1 + 3 + 643 + 8 + 2 + 8 + 1 = 666.

It is not a de Polignac number, because 136438281 - 2¹ = 136438279 is a prime.

It is a super-2 number, since 2×136438281² = 37230809044469922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (136438261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1082781 + ... + 1082906.

It is an arithmetic number, because the mean of its divisors is an integer number (18769296).

Almost surely, 2^136438281 is an apocalyptic number.

It is an amenable number.

136438281 is a deficient number, since it is larger than the sum of its proper divisors (88793271).

136438281 is a wasteful number, since it uses less digits than its factorization.

136438281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2165700 (or 2165697 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 136438281 is about 11680.6798175449. The cubic root of 136438281 is about 514.8081492326.

The spelling of 136438281 in words is "one hundred thirty-six million, four hundred thirty-eight thousand, two hundred eighty-one".