211990469 has 2 divisors, whose sum is σ = 211990470. Its totient is φ = 211990468.

The previous prime is 211990463. The next prime is 211990487. The reversal of 211990469 is 964099112.

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., 197739844 + 14250625 = 14062^2 + 3775^2 .

It is a cyclic number.

It is not a de Polignac number, because 211990469 - 2⁴ = 211990453 is a prime.

It is a super-2 number, since 2×211990469² = 89879917893679922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211990463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105995234 + 105995235.

It is an arithmetic number, because the mean of its divisors is an integer number (105995235).

Almost surely, 2^211990469 is an apocalyptic number.

It is an amenable number.

211990469 is a deficient number, since it is larger than the sum of its proper divisors (1).

211990469 is an equidigital number, since it uses as much as digits as its factorization.

211990469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 211990469 is about 14559.8924789986. The cubic root of 211990469 is about 596.2642599803.

The spelling of 211990469 in words is "two hundred eleven million, nine hundred ninety thousand, four hundred sixty-nine".