690754491209 has 2 divisors, whose sum is σ = 690754491210. Its totient is φ = 690754491208.

The previous prime is 690754491181. The next prime is 690754491289. The reversal of 690754491209 is 902194457096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 530071363600 + 160683127609 = 728060^2 + 400853^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690754491209 is a prime.

It is not a weakly prime, because it can be changed into another prime (690754491289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345377245604 + 345377245605.

It is an arithmetic number, because the mean of its divisors is an integer number (345377245605).

Almost surely, 2^690754491209 is an apocalyptic number.

It is an amenable number.

690754491209 is a deficient number, since it is larger than the sum of its proper divisors (1).

690754491209 is an equidigital number, since it uses as much as digits as its factorization.

690754491209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4898880, while the sum is 56.

The spelling of 690754491209 in words is "six hundred ninety billion, seven hundred fifty-four million, four hundred ninety-one thousand, two hundred nine".