136840231 has 18 divisors (see below), whose sum is σ = 156080288. Its totient is φ = 119757000.

The previous prime is 136840211. The next prime is 136840237. The reversal of 136840231 is 132048631.

It is not a de Polignac number, because 136840231 - 2⁵ = 136840199 is a prime.

It is a super-2 number, since 2×136840231² = 37450497640266722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 136840231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136840237) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 716346 + ... + 716536.

Almost surely, 2^136840231 is an apocalyptic number.

136840231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

136840231 is a deficient number, since it is larger than the sum of its proper divisors (19240057).

136840231 is an equidigital number, since it uses as much as digits as its factorization.

136840231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435 (or 233 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 136840231 is about 11697.8729263059. The cubic root of 136840231 is about 515.3131987493.

Adding to 136840231 its reverse (132048631), we get a palindrome (268888862).

The spelling of 136840231 in words is "one hundred thirty-six million, eight hundred forty thousand, two hundred thirty-one".