1791691856 has 10 divisors (see below), whose sum is σ = 3471403002. Its totient is φ = 895845920.

The previous prime is 1791691843. The next prime is 1791691861. The reversal of 1791691856 is 6581961971.

It can be written as a sum of positive squares in only one way, i.e., 1280208400 + 511483456 = 35780^2 + 22616^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1791691798 and 1791691807.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55990355 + ... + 55990386.

Almost surely, 2^1791691856 is an apocalyptic number.

1791691856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1791691856 is a deficient number, since it is larger than the sum of its proper divisors (1679711146).

1791691856 is a wasteful number, since it uses less digits than its factorization.

1791691856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111980749 (or 111980743 counting only the distinct ones).

The product of its digits is 816480, while the sum is 53.

The square root of 1791691856 is about 42328.3812116646. The cubic root of 1791691856 is about 1214.5659637272.

The spelling of 1791691856 in words is "one billion, seven hundred ninety-one million, six hundred ninety-one thousand, eight hundred fifty-six".