213439819 has 2 divisors, whose sum is σ = 213439820. Its totient is φ = 213439818.

The previous prime is 213439817. The next prime is 213439829. The reversal of 213439819 is 918934312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213439819 - 2¹ = 213439817 is a prime.

It is a super-2 number, since 2×213439819² = 91113112669505522, which contains 22 as substring.

Together with 213439817, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (213439813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106719909 + 106719910.

It is an arithmetic number, because the mean of its divisors is an integer number (106719910).

Almost surely, 2^213439819 is an apocalyptic number.

213439819 is a deficient number, since it is larger than the sum of its proper divisors (1).

213439819 is an equidigital number, since it uses as much as digits as its factorization.

213439819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 40.

The square root of 213439819 is about 14609.5796996354. The cubic root of 213439819 is about 597.6200341232.

The spelling of 213439819 in words is "two hundred thirteen million, four hundred thirty-nine thousand, eight hundred nineteen".