690960217 has 2 divisors, whose sum is σ = 690960218. Its totient is φ = 690960216.

The previous prime is 690960191. The next prime is 690960239. The reversal of 690960217 is 712069096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 368793616 + 322166601 = 19204^2 + 17949^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690960217 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 690960217.

It is not a weakly prime, because it can be changed into another prime (690960247) 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, 345480108 + 345480109.

It is an arithmetic number, because the mean of its divisors is an integer number (345480109).

Almost surely, 2^690960217 is an apocalyptic number.

It is an amenable number.

690960217 is a deficient number, since it is larger than the sum of its proper divisors (1).

690960217 is an equidigital number, since it uses as much as digits as its factorization.

690960217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 690960217 is about 26286.1221369756. The cubic root of 690960217 is about 884.0653061675.

The spelling of 690960217 in words is "six hundred ninety million, nine hundred sixty thousand, two hundred seventeen".