210945481 has 2 divisors, whose sum is σ = 210945482. Its totient is φ = 210945480.

The previous prime is 210945479. The next prime is 210945491. The reversal of 210945481 is 184549012.

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., 195860025 + 15085456 = 13995^2 + 3884^2 .

It is a cyclic number.

It is not a de Polignac number, because 210945481 - 2¹ = 210945479 is a prime.

It is a super-2 number, since 2×210945481² = 88995991908642722, which contains 22 as substring.

Together with 210945479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (210945491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105472740 + 105472741.

It is an arithmetic number, because the mean of its divisors is an integer number (105472741).

Almost surely, 2^210945481 is an apocalyptic number.

It is an amenable number.

210945481 is a deficient number, since it is larger than the sum of its proper divisors (1).

210945481 is an equidigital number, since it uses as much as digits as its factorization.

210945481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 210945481 is about 14523.9623037241. The cubic root of 210945481 is about 595.2829019773.

The spelling of 210945481 in words is "two hundred ten million, nine hundred forty-five thousand, four hundred eighty-one".