690688211 has 2 divisors, whose sum is σ = 690688212. Its totient is φ = 690688210.

The previous prime is 690688123. The next prime is 690688241. The reversal of 690688211 is 112886096.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 690688211 - 2¹⁴ = 690671827 is a prime.

It is not a weakly prime, because it can be changed into another prime (690688241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345344105 + 345344106.

It is an arithmetic number, because the mean of its divisors is an integer number (345344106).

Almost surely, 2^690688211 is an apocalyptic number.

690688211 is a deficient number, since it is larger than the sum of its proper divisors (1).

690688211 is an equidigital number, since it uses as much as digits as its factorization.

690688211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 690688211 is about 26280.9476807820. The cubic root of 690688211 is about 883.9492827826.

The spelling of 690688211 in words is "six hundred ninety million, six hundred eighty-eight thousand, two hundred eleven".