210799681 has 2 divisors, whose sum is σ = 210799682. Its totient is φ = 210799680.

The previous prime is 210799679. The next prime is 210799739. The reversal of 210799681 is 186997012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183331600 + 27468081 = 13540^2 + 5241^2 .

It is a cyclic number.

It is not a de Polignac number, because 210799681 - 2¹ = 210799679 is a prime.

It is a super-2 number, since 2×210799681² = 88873011019403522, which contains 22 as substring.

Together with 210799679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (210799601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105399840 + 105399841.

It is an arithmetic number, because the mean of its divisors is an integer number (105399841).

Almost surely, 2^210799681 is an apocalyptic number.

It is an amenable number.

210799681 is a deficient number, since it is larger than the sum of its proper divisors (1).

210799681 is an equidigital number, since it uses as much as digits as its factorization.

210799681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 210799681 is about 14518.9421446605. The cubic root of 210799681 is about 595.1457223759.

The spelling of 210799681 in words is "two hundred ten million, seven hundred ninety-nine thousand, six hundred eighty-one".