213820469 has 2 divisors, whose sum is σ = 213820470. Its totient is φ = 213820468.

The previous prime is 213820459. The next prime is 213820483. The reversal of 213820469 is 964028312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132135025 + 81685444 = 11495^2 + 9038^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213820469 is a prime.

It is a super-2 number, since 2×213820469² = 91438385926759922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213820429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106910234 + 106910235.

It is an arithmetic number, because the mean of its divisors is an integer number (106910235).

Almost surely, 2^213820469 is an apocalyptic number.

It is an amenable number.

213820469 is a deficient number, since it is larger than the sum of its proper divisors (1).

213820469 is an equidigital number, since it uses as much as digits as its factorization.

213820469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 213820469 is about 14622.6013075649. The cubic root of 213820469 is about 597.9750896586.

The spelling of 213820469 in words is "two hundred thirteen million, eight hundred twenty thousand, four hundred sixty-nine".