210064991 has 2 divisors, whose sum is σ = 210064992. Its totient is φ = 210064990.

The previous prime is 210064979. The next prime is 210065027. The reversal of 210064991 is 199460012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 210064991 - 2⁶ = 210064927 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 (210064891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105032495 + 105032496.

It is an arithmetic number, because the mean of its divisors is an integer number (105032496).

Almost surely, 2^210064991 is an apocalyptic number.

210064991 is a deficient number, since it is larger than the sum of its proper divisors (1).

210064991 is an equidigital number, since it uses as much as digits as its factorization.

210064991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 210064991 is about 14493.6189752594. The cubic root of 210064991 is about 594.4535066394.

The spelling of 210064991 in words is "two hundred ten million, sixty-four thousand, nine hundred ninety-one".