1688831047 has 2 divisors, whose sum is σ = 1688831048. Its totient is φ = 1688831046.

The previous prime is 1688831009. The next prime is 1688831077. The reversal of 1688831047 is 7401388861.

It is a strong prime.

It is an emirp because it is prime and its reverse (7401388861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1688831047 - 2⁷ = 1688830919 is a prime.

It is a super-2 number, since 2×1688831047² = 5704300610622232418, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1688830988 and 1688831006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1688831077) by changing a digit.

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, 844415523 + 844415524.

It is an arithmetic number, because the mean of its divisors is an integer number (844415524).

Almost surely, 2^1688831047 is an apocalyptic number.

1688831047 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688831047 is an equidigital number, since it uses as much as digits as its factorization.

1688831047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 258048, while the sum is 46.

The square root of 1688831047 is about 41095.3896075947. The cubic root of 1688831047 is about 1190.8637297347.

The spelling of 1688831047 in words is "one billion, six hundred eighty-eight million, eight hundred thirty-one thousand, forty-seven".