211515013 has 2 divisors, whose sum is σ = 211515014. Its totient is φ = 211515012.

The previous prime is 211515001. The next prime is 211515053. The reversal of 211515013 is 310515112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122722084 + 88792929 = 11078^2 + 9423^2 .

It is a cyclic number.

It is not a de Polignac number, because 211515013 - 2⁵ = 211514981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211515053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105757506 + 105757507.

It is an arithmetic number, because the mean of its divisors is an integer number (105757507).

Almost surely, 2^211515013 is an apocalyptic number.

It is an amenable number.

211515013 is a deficient number, since it is larger than the sum of its proper divisors (1).

211515013 is an equidigital number, since it uses as much as digits as its factorization.

211515013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 211515013 is about 14543.5557206620. Note that the first 3 decimals coincide. The cubic root of 211515013 is about 595.8181556025.

Subtracting 211515013 from its reverse (310515112), we obtain a palindrome (99000099).

The spelling of 211515013 in words is "two hundred eleven million, five hundred fifteen thousand, thirteen".