211304513 has 6 divisors (see below), whose sum is σ = 245803266. Its totient is φ = 181118112.

The previous prime is 211304507. The next prime is 211304557. The reversal of 211304513 is 315403112.

It can be written as a sum of positive squares in only one way, i.e., 131148304 + 80156209 = 11452^2 + 8953^2 .

It is not a de Polignac number, because 211304513 - 2⁸ = 211304257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211304503) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2156120 + ... + 2156217.

It is an arithmetic number, because the mean of its divisors is an integer number (40967211).

Almost surely, 2^211304513 is an apocalyptic number.

It is an amenable number.

211304513 is a deficient number, since it is larger than the sum of its proper divisors (34498753).

211304513 is an equidigital number, since it uses as much as digits as its factorization.

211304513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4312351 (or 4312344 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 211304513 is about 14536.3170369939. The cubic root of 211304513 is about 595.6204370120.

Adding to 211304513 its reverse (315403112), we get a palindrome (526707625).

The spelling of 211304513 in words is "two hundred eleven million, three hundred four thousand, five hundred thirteen".