1688540123 has 2 divisors, whose sum is σ = 1688540124. Its totient is φ = 1688540122.

The previous prime is 1688540107. The next prime is 1688540153. The reversal of 1688540123 is 3210458861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1688540123 - 2⁴ = 1688540107 is a prime.

It is not a weakly prime, because it can be changed into another prime (1688540153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844270061 + 844270062.

It is an arithmetic number, because the mean of its divisors is an integer number (844270062).

Almost surely, 2^1688540123 is an apocalyptic number.

1688540123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688540123 is an equidigital number, since it uses as much as digits as its factorization.

1688540123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 1688540123 is about 41091.8498366769. The cubic root of 1688540123 is about 1190.7953450107.

Adding to 1688540123 its reverse (3210458861), we get a palindrome (4898998984).

The spelling of 1688540123 in words is "one billion, six hundred eighty-eight million, five hundred forty thousand, one hundred twenty-three".