690984211 has 2 divisors, whose sum is σ = 690984212. Its totient is φ = 690984210.

The previous prime is 690984187. The next prime is 690984233. The reversal of 690984211 is 112489096.

690984211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690984211 is a prime.

It is not a weakly prime, because it can be changed into another prime (690984011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345492105 + 345492106.

It is an arithmetic number, because the mean of its divisors is an integer number (345492106).

Almost surely, 2^690984211 is an apocalyptic number.

690984211 is a deficient number, since it is larger than the sum of its proper divisors (1).

690984211 is an equidigital number, since it uses as much as digits as its factorization.

690984211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 690984211 is about 26286.5785335406. The cubic root of 690984211 is about 884.0755392783.

The spelling of 690984211 in words is "six hundred ninety million, nine hundred eighty-four thousand, two hundred eleven".