213664819 has 2 divisors, whose sum is σ = 213664820. Its totient is φ = 213664818.

The previous prime is 213664811. The next prime is 213664859. The reversal of 213664819 is 918466312.

It is an a-pointer prime, because the next prime (213664859) can be obtained adding 213664819 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213664819 - 2³ = 213664811 is a prime.

It is a super-2 number, since 2×213664819² = 91305309756605522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (213664811) 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, 106832409 + 106832410.

It is an arithmetic number, because the mean of its divisors is an integer number (106832410).

Almost surely, 2^213664819 is an apocalyptic number.

213664819 is a deficient number, since it is larger than the sum of its proper divisors (1).

213664819 is an equidigital number, since it uses as much as digits as its factorization.

213664819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 40.

The square root of 213664819 is about 14617.2780981960. The cubic root of 213664819 is about 597.8299563499.

The spelling of 213664819 in words is "two hundred thirteen million, six hundred sixty-four thousand, eight hundred nineteen".