206231845 has 36 divisors (see below), whose sum is σ = 273945924. Its totient is φ = 148925440.

The previous prime is 206231819. The next prime is 206231849. The reversal of 206231845 is 548132602.

It can be written as a sum of positive squares in 6 ways, for example, as 682276 + 205549569 = 826^2 + 14337^2 .

It is not a de Polignac number, because 206231845 - 2¹³ = 206223653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206231849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3495426 + ... + 3495484.

It is an arithmetic number, because the mean of its divisors is an integer number (7609609).

Almost surely, 2^206231845 is an apocalyptic number.

It is an amenable number.

206231845 is a deficient number, since it is larger than the sum of its proper divisors (67714079).

206231845 is an equidigital number, since it uses as much as digits as its factorization.

206231845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 122 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 206231845 is about 14360.7745264662. The cubic root of 206231845 is about 590.8155388530.

The spelling of 206231845 in words is "two hundred six million, two hundred thirty-one thousand, eight hundred forty-five".