690140309 has 2 divisors, whose sum is σ = 690140310. Its totient is φ = 690140308.

The previous prime is 690140303. The next prime is 690140329. The reversal of 690140309 is 903041096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 671950084 + 18190225 = 25922^2 + 4265^2 .

It is a cyclic number.

It is not a de Polignac number, because 690140309 - 2²⁸ = 421704853 is a prime.

It is a super-2 number, since 2×690140309² = 952587292213230962, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690140303) 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, 345070154 + 345070155.

It is an arithmetic number, because the mean of its divisors is an integer number (345070155).

Almost surely, 2^690140309 is an apocalyptic number.

It is an amenable number.

690140309 is a deficient number, since it is larger than the sum of its proper divisors (1).

690140309 is an equidigital number, since it uses as much as digits as its factorization.

690140309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 690140309 is about 26270.5216735412. The cubic root of 690140309 is about 883.7154842353.

The spelling of 690140309 in words is "six hundred ninety million, one hundred forty thousand, three hundred nine".