206810431 has 2 divisors, whose sum is σ = 206810432. Its totient is φ = 206810430.

The previous prime is 206810381. The next prime is 206810449. The reversal of 206810431 is 134018602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206810431 is a prime.

It is a super-2 number, since 2×206810431² = 85541108740811522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 206810396 and 206810405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206811431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103405215 + 103405216.

It is an arithmetic number, because the mean of its divisors is an integer number (103405216).

Almost surely, 2^206810431 is an apocalyptic number.

206810431 is a deficient number, since it is larger than the sum of its proper divisors (1).

206810431 is an equidigital number, since it uses as much as digits as its factorization.

206810431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 206810431 is about 14380.9050827825. The cubic root of 206810431 is about 591.3675364040.

The spelling of 206810431 in words is "two hundred six million, eight hundred ten thousand, four hundred thirty-one".