211664039 has 2 divisors, whose sum is σ = 211664040. Its totient is φ = 211664038.

The previous prime is 211664023. The next prime is 211664053. The reversal of 211664039 is 930466112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211664039 - 2⁴ = 211664023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211663996 and 211664014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211664639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105832019 + 105832020.

It is an arithmetic number, because the mean of its divisors is an integer number (105832020).

Almost surely, 2^211664039 is an apocalyptic number.

211664039 is a deficient number, since it is larger than the sum of its proper divisors (1).

211664039 is an equidigital number, since it uses as much as digits as its factorization.

211664039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 211664039 is about 14548.6782561166. The cubic root of 211664039 is about 595.9580535543.

The spelling of 211664039 in words is "two hundred eleven million, six hundred sixty-four thousand, thirty-nine".