210039997 has 2 divisors, whose sum is σ = 210039998. Its totient is φ = 210039996.

The previous prime is 210039961. The next prime is 210040001. The reversal of 210039997 is 799930012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106936281 + 103103716 = 10341^2 + 10154^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210039997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210039917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105019998 + 105019999.

It is an arithmetic number, because the mean of its divisors is an integer number (105019999).

Almost surely, 2^210039997 is an apocalyptic number.

It is an amenable number.

210039997 is a deficient number, since it is larger than the sum of its proper divisors (1).

210039997 is an equidigital number, since it uses as much as digits as its factorization.

210039997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 210039997 is about 14492.7567080939. The cubic root of 210039997 is about 594.4299292373.

The spelling of 210039997 in words is "two hundred ten million, thirty-nine thousand, nine hundred ninety-seven".