1691989029593 has 4 divisors (see below), whose sum is σ = 1692034207248. Its totient is φ = 1691943851940.

The previous prime is 1691989029581. The next prime is 1691989029611. The reversal of 1691989029593 is 3959209891961.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1691989029593 - 2³⁰ = 1690915287769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1691989026593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22532603 + ... + 22607568.

It is an arithmetic number, because the mean of its divisors is an integer number (423008551812).

Almost surely, 2^{1691989029593} is an apocalyptic number.

It is an amenable number.

1691989029593 is a deficient number, since it is larger than the sum of its proper divisors (45177655).

1691989029593 is an equidigital number, since it uses as much as digits as its factorization.

1691989029593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45177654.

The product of its (nonzero) digits is 85030560, while the sum is 71.

The spelling of 1691989029593 in words is "one trillion, six hundred ninety-one billion, nine hundred eighty-nine million, twenty-nine thousand, five hundred ninety-three".