205237997 has 2 divisors, whose sum is σ = 205237998. Its totient is φ = 205237996.

The previous prime is 205237987. The next prime is 205238021. The reversal of 205237997 is 799732502.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205234276 + 3721 = 14326^2 + 61^2 .

It is a cyclic number.

It is not a de Polignac number, because 205237997 - 2⁶ = 205237933 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205237987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102618998 + 102618999.

It is an arithmetic number, because the mean of its divisors is an integer number (102618999).

Almost surely, 2^205237997 is an apocalyptic number.

It is an amenable number.

205237997 is a deficient number, since it is larger than the sum of its proper divisors (1).

205237997 is an equidigital number, since it uses as much as digits as its factorization.

205237997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 238140, while the sum is 44.

The square root of 205237997 is about 14326.1298681814. The cubic root of 205237997 is about 589.8649475430.

The spelling of 205237997 in words is "two hundred five million, two hundred thirty-seven thousand, nine hundred ninety-seven".