206431045 has 4 divisors (see below), whose sum is σ = 247717260. Its totient is φ = 165144832.

The previous prime is 206431037. The next prime is 206431061. The reversal of 206431045 is 540134602.

206431045 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 31741956 + 174689089 = 5634^2 + 13217^2 .

It is a cyclic number.

It is not a de Polignac number, because 206431045 - 2³ = 206431037 is a prime.

It is a super-2 number, since 2×206431045² = 85227552679584050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20643100 + ... + 20643109.

It is an arithmetic number, because the mean of its divisors is an integer number (61929315).

Almost surely, 2^206431045 is an apocalyptic number.

It is an amenable number.

206431045 is a deficient number, since it is larger than the sum of its proper divisors (41286215).

206431045 is an equidigital number, since it uses as much as digits as its factorization.

206431045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41286214.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 206431045 is about 14367.7084115735. The cubic root of 206431045 is about 591.0057011808.

Adding to 206431045 its reverse (540134602), we get a palindrome (746565647).

The spelling of 206431045 in words is "two hundred six million, four hundred thirty-one thousand, forty-five".