213189517 has 2 divisors, whose sum is σ = 213189518. Its totient is φ = 213189516.

The previous prime is 213189497. The next prime is 213189533. The reversal of 213189517 is 715981312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209265156 + 3924361 = 14466^2 + 1981^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213189517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213189577) 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, 106594758 + 106594759.

It is an arithmetic number, because the mean of its divisors is an integer number (106594759).

Almost surely, 2^213189517 is an apocalyptic number.

It is an amenable number.

213189517 is a deficient number, since it is larger than the sum of its proper divisors (1).

213189517 is an equidigital number, since it uses as much as digits as its factorization.

213189517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 37.

The square root of 213189517 is about 14601.0108211726. The cubic root of 213189517 is about 597.3863320242.

The spelling of 213189517 in words is "two hundred thirteen million, one hundred eighty-nine thousand, five hundred seventeen".