213999449 has 2 divisors, whose sum is σ = 213999450. Its totient is φ = 213999448.

The previous prime is 213999437. The next prime is 213999463. The reversal of 213999449 is 944999312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190302025 + 23697424 = 13795^2 + 4868^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213999449 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 213999397 and 213999406.

It is not a weakly prime, because it can be changed into another prime (213999419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106999724 + 106999725.

It is an arithmetic number, because the mean of its divisors is an integer number (106999725).

Almost surely, 2^213999449 is an apocalyptic number.

It is an amenable number.

213999449 is a deficient number, since it is larger than the sum of its proper divisors (1).

213999449 is an equidigital number, since it uses as much as digits as its factorization.

213999449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 50.

The square root of 213999449 is about 14628.7200055234. The cubic root of 213999449 is about 598.1418896127.

The spelling of 213999449 in words is "two hundred thirteen million, nine hundred ninety-nine thousand, four hundred forty-nine".