136578231 has 20 divisors (see below), whose sum is σ = 206139472. Its totient is φ = 90108288.

The previous prime is 136578217. The next prime is 136578283. The reversal of 136578231 is 132875631.

It is not a de Polignac number, because 136578231 - 2¹⁴ = 136561847 is a prime.

It is a super-2 number, since 2×136578231² = 37307226366178722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136578131) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 835 + ... + 16548.

Almost surely, 2^136578231 is an apocalyptic number.

136578231 is a deficient number, since it is larger than the sum of its proper divisors (69561241).

136578231 is an equidigital number, since it uses as much as digits as its factorization.

136578231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17492 (or 17483 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 136578231 is about 11686.6689437153. The cubic root of 136578231 is about 514.9841085994.

The spelling of 136578231 in words is "one hundred thirty-six million, five hundred seventy-eight thousand, two hundred thirty-one".