1691676893 has 2 divisors, whose sum is σ = 1691676894. Its totient is φ = 1691676892.

The previous prime is 1691676881. The next prime is 1691676901. The reversal of 1691676893 is 3986761961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1345642489 + 346034404 = 36683^2 + 18602^2 .

It is a cyclic number.

It is not a de Polignac number, because 1691676893 - 2¹² = 1691672797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1691676823) 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, 845838446 + 845838447.

It is an arithmetic number, because the mean of its divisors is an integer number (845838447).

Almost surely, 2^1691676893 is an apocalyptic number.

It is an amenable number.

1691676893 is a deficient number, since it is larger than the sum of its proper divisors (1).

1691676893 is an equidigital number, since it uses as much as digits as its factorization.

1691676893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2939328, while the sum is 56.

The square root of 1691676893 is about 41129.9999149040. Note that the first 4 decimals coincide. The cubic root of 1691676893 is about 1191.5322617667.

The spelling of 1691676893 in words is "one billion, six hundred ninety-one million, six hundred seventy-six thousand, eight hundred ninety-three".