690809593 has 2 divisors, whose sum is σ = 690809594. Its totient is φ = 690809592.

The previous prime is 690809591. The next prime is 690809633. The reversal of 690809593 is 395908096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 676156009 + 14653584 = 26003^2 + 3828^2 .

It is a cyclic number.

It is not a de Polignac number, because 690809593 - 2¹ = 690809591 is a prime.

Together with 690809591, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (690809591) 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, 345404796 + 345404797.

It is an arithmetic number, because the mean of its divisors is an integer number (345404797).

Almost surely, 2^690809593 is an apocalyptic number.

It is an amenable number.

690809593 is a deficient number, since it is larger than the sum of its proper divisors (1).

690809593 is an equidigital number, since it uses as much as digits as its factorization.

690809593 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 524880, while the sum is 49.

The square root of 690809593 is about 26283.2568948371. The cubic root of 690809593 is about 884.0010616921.

The spelling of 690809593 in words is "six hundred ninety million, eight hundred nine thousand, five hundred ninety-three".