213943811 has 2 divisors, whose sum is σ = 213943812. Its totient is φ = 213943810.

The previous prime is 213943799. The next prime is 213943813. The reversal of 213943811 is 118349312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213943811 is a prime.

It is a Sophie Germain prime.

Together with 213943813, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213943813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106971905 + 106971906.

It is an arithmetic number, because the mean of its divisors is an integer number (106971906).

Almost surely, 2^213943811 is an apocalyptic number.

213943811 is a deficient number, since it is larger than the sum of its proper divisors (1).

213943811 is an equidigital number, since it uses as much as digits as its factorization.

213943811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 213943811 is about 14626.8182117643. The cubic root of 213943811 is about 598.0900478857.

The spelling of 213943811 in words is "two hundred thirteen million, nine hundred forty-three thousand, eight hundred eleven".