1693540789 has 2 divisors, whose sum is σ = 1693540790. Its totient is φ = 1693540788.

The previous prime is 1693540759. The next prime is 1693540817. The reversal of 1693540789 is 9870453961.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1644302500 + 49238289 = 40550^2 + 7017^2 .

It is an emirp because it is prime and its reverse (9870453961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1693540789 - 2¹⁷ = 1693409717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1693540759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 846770394 + 846770395.

It is an arithmetic number, because the mean of its divisors is an integer number (846770395).

Almost surely, 2^1693540789 is an apocalyptic number.

It is an amenable number.

1693540789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1693540789 is an equidigital number, since it uses as much as digits as its factorization.

1693540789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The square root of 1693540789 is about 41152.6522717552. The cubic root of 1693540789 is about 1191.9697127287.

The spelling of 1693540789 in words is "one billion, six hundred ninety-three million, five hundred forty thousand, seven hundred eighty-nine".