1688540107 has 2 divisors, whose sum is σ = 1688540108. Its totient is φ = 1688540106.

The previous prime is 1688540099. The next prime is 1688540123. The reversal of 1688540107 is 7010458861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1688540107 - 2³ = 1688540099 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1688540107.

It is not a weakly prime, because it can be changed into another prime (1688540407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844270053 + 844270054.

It is an arithmetic number, because the mean of its divisors is an integer number (844270054).

Almost surely, 2^1688540107 is an apocalyptic number.

1688540107 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688540107 is an equidigital number, since it uses as much as digits as its factorization.

1688540107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 1688540107 is about 41091.8496419911. The cubic root of 1688540107 is about 1190.7953412495.

Adding to 1688540107 its reverse (7010458861), we get a palindrome (8698998968).

The spelling of 1688540107 in words is "one billion, six hundred eighty-eight million, five hundred forty thousand, one hundred seven".