1684634993 has 2 divisors, whose sum is σ = 1684634994. Its totient is φ = 1684634992.

The previous prime is 1684634989. The next prime is 1684635011. The reversal of 1684634993 is 3994364861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 848673424 + 835961569 = 29132^2 + 28913^2 .

It is an emirp because it is prime and its reverse (3994364861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1684634993 - 2² = 1684634989 is a prime.

It is a super-2 number, since 2×1684634993² = 5675990119280220098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1684634983) 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, 842317496 + 842317497.

It is an arithmetic number, because the mean of its divisors is an integer number (842317497).

Almost surely, 2^1684634993 is an apocalyptic number.

It is an amenable number.

1684634993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1684634993 is an equidigital number, since it uses as much as digits as its factorization.

1684634993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3359232, while the sum is 53.

The square root of 1684634993 is about 41044.3052444550. The cubic root of 1684634993 is about 1189.8766421102.

The spelling of 1684634993 in words is "one billion, six hundred eighty-four million, six hundred thirty-four thousand, nine hundred ninety-three".