211642513 has 2 divisors, whose sum is σ = 211642514. Its totient is φ = 211642512.

The previous prime is 211642511. The next prime is 211642523. The reversal of 211642513 is 315246112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208282624 + 3359889 = 14432^2 + 1833^2 .

It is a cyclic number.

It is not a de Polignac number, because 211642513 - 2¹ = 211642511 is a prime.

Together with 211642511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (211642511) 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, 105821256 + 105821257.

It is an arithmetic number, because the mean of its divisors is an integer number (105821257).

Almost surely, 2^211642513 is an apocalyptic number.

It is an amenable number.

211642513 is a deficient number, since it is larger than the sum of its proper divisors (1).

211642513 is an equidigital number, since it uses as much as digits as its factorization.

211642513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 211642513 is about 14547.9384450169. The cubic root of 211642513 is about 595.9378501099.

Adding to 211642513 its reverse (315246112), we get a palindrome (526888625).

The spelling of 211642513 in words is "two hundred eleven million, six hundred forty-two thousand, five hundred thirteen".