205250831 has 2 divisors, whose sum is σ = 205250832. Its totient is φ = 205250830.

The previous prime is 205250813. The next prime is 205250839. The reversal of 205250831 is 138052502.

Together with previous prime (205250813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205250831 - 2⁶ = 205250767 is a prime.

It is a super-2 number, since 2×205250831² = 84255807252381122, 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 205250831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205250839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102625415 + 102625416.

It is an arithmetic number, because the mean of its divisors is an integer number (102625416).

Almost surely, 2^205250831 is an apocalyptic number.

205250831 is a deficient number, since it is larger than the sum of its proper divisors (1).

205250831 is an equidigital number, since it uses as much as digits as its factorization.

205250831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 205250831 is about 14326.5777839650. The cubic root of 205250831 is about 589.8772424868.

The spelling of 205250831 in words is "two hundred five million, two hundred fifty thousand, eight hundred thirty-one".