1691055823 has 2 divisors, whose sum is σ = 1691055824. Its totient is φ = 1691055822.

The previous prime is 1691055809. The next prime is 1691055829. The reversal of 1691055823 is 3285501961.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1691055823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1691055829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845527911 + 845527912.

It is an arithmetic number, because the mean of its divisors is an integer number (845527912).

Almost surely, 2^1691055823 is an apocalyptic number.

1691055823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1691055823 is an equidigital number, since it uses as much as digits as its factorization.

1691055823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 1691055823 is about 41122.4491366942. The cubic root of 1691055823 is about 1191.3864270773.

The spelling of 1691055823 in words is "one billion, six hundred ninety-one million, fifty-five thousand, eight hundred twenty-three".