210009997 has 2 divisors, whose sum is σ = 210009998. Its totient is φ = 210009996.

The previous prime is 210009991. The next prime is 210010001. The reversal of 210009997 is 799900012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193599396 + 16410601 = 13914^2 + 4051^2 .

It is a cyclic number.

It is not a de Polignac number, because 210009997 - 2¹⁹ = 209485709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210009991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105004998 + 105004999.

It is an arithmetic number, because the mean of its divisors is an integer number (105004999).

Almost surely, 2^210009997 is an apocalyptic number.

It is an amenable number.

210009997 is a deficient number, since it is larger than the sum of its proper divisors (1).

210009997 is an equidigital number, since it uses as much as digits as its factorization.

210009997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 210009997 is about 14491.7216713543. The cubic root of 210009997 is about 594.4016270930.

The spelling of 210009997 in words is "two hundred ten million, nine thousand, nine hundred ninety-seven".