206240831 has 2 divisors, whose sum is σ = 206240832. Its totient is φ = 206240830.

The previous prime is 206240791. The next prime is 206240843. The reversal of 206240831 is 138042602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206240831 is a prime.

It is a super-2 number, since 2×206240831² = 85070560743141122, 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 206240831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206240851) 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, 103120415 + 103120416.

It is an arithmetic number, because the mean of its divisors is an integer number (103120416).

Almost surely, 2^206240831 is an apocalyptic number.

206240831 is a deficient number, since it is larger than the sum of its proper divisors (1).

206240831 is an equidigital number, since it uses as much as digits as its factorization.

206240831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 206240831 is about 14361.0873891917. The cubic root of 206240831 is about 590.8241197963.

The spelling of 206240831 in words is "two hundred six million, two hundred forty thousand, eight hundred thirty-one".