206420231135 has 4 divisors (see below), whose sum is σ = 247704277368. Its totient is φ = 165136184904.

The previous prime is 206420231131. The next prime is 206420231141. The reversal of 206420231135 is 531132024602.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 206420231135 - 2² = 206420231131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206420231098 and 206420231107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206420231131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20642023109 + ... + 20642023118.

It is an arithmetic number, because the mean of its divisors is an integer number (61926069342).

Almost surely, 2^206420231135 is an apocalyptic number.

206420231135 is a deficient number, since it is larger than the sum of its proper divisors (41284046233).

206420231135 is an equidigital number, since it uses as much as digits as its factorization.

206420231135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41284046232.

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 206420231135 its reverse (531132024602), we get a palindrome (737552255737).

The spelling of 206420231135 in words is "two hundred six billion, four hundred twenty million, two hundred thirty-one thousand, one hundred thirty-five".