690334993 has 2 divisors, whose sum is σ = 690334994. Its totient is φ = 690334992.

The previous prime is 690334973. The next prime is 690335039. The reversal of 690334993 is 399433096.

It is an a-pointer prime, because the next prime (690335039) can be obtained adding 690334993 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 689745169 + 589824 = 26263^2 + 768^2 .

It is a cyclic number.

It is not a de Polignac number, because 690334993 - 2²¹ = 688237841 is a prime.

It is not a weakly prime, because it can be changed into another prime (690334973) 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, 345167496 + 345167497.

It is an arithmetic number, because the mean of its divisors is an integer number (345167497).

Almost surely, 2^690334993 is an apocalyptic number.

It is an amenable number.

690334993 is a deficient number, since it is larger than the sum of its proper divisors (1).

690334993 is an equidigital number, since it uses as much as digits as its factorization.

690334993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 472392, while the sum is 46.

The square root of 690334993 is about 26274.2267821529. The cubic root of 690334993 is about 883.7985731802.

The spelling of 690334993 in words is "six hundred ninety million, three hundred thirty-four thousand, nine hundred ninety-three".