690204689 has 2 divisors, whose sum is σ = 690204690. Its totient is φ = 690204688.

The previous prime is 690204679. The next prime is 690204733. The reversal of 690204689 is 986402096.

It is an a-pointer prime, because the next prime (690204733) can be obtained adding 690204689 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 493728400 + 196476289 = 22220^2 + 14017^2 .

It is a cyclic number.

It is not a de Polignac number, because 690204689 - 2⁴ = 690204673 is a prime.

It is not a weakly prime, because it can be changed into another prime (690204629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345102344 + 345102345.

It is an arithmetic number, because the mean of its divisors is an integer number (345102345).

Almost surely, 2^690204689 is an apocalyptic number.

It is an amenable number.

690204689 is a deficient number, since it is larger than the sum of its proper divisors (1).

690204689 is an equidigital number, since it uses as much as digits as its factorization.

690204689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 690204689 is about 26271.7469727462. The cubic root of 690204689 is about 883.7429626254.

It can be divided in two parts, 690 and 204689, that added together give a cube (205379 = 59³).

The spelling of 690204689 in words is "six hundred ninety million, two hundred four thousand, six hundred eighty-nine".