1688743141 has 2 divisors, whose sum is σ = 1688743142. Its totient is φ = 1688743140.

The previous prime is 1688743103. The next prime is 1688743151. The reversal of 1688743141 is 1413478861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1272991041 + 415752100 = 35679^2 + 20390^2 .

It is an emirp because it is prime and its reverse (1413478861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1688743141 - 2¹⁷ = 1688612069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1688743151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844371570 + 844371571.

It is an arithmetic number, because the mean of its divisors is an integer number (844371571).

Almost surely, 2^1688743141 is an apocalyptic number.

It is an amenable number.

1688743141 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688743141 is an equidigital number, since it uses as much as digits as its factorization.

1688743141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 43.

The square root of 1688743141 is about 41094.3200576430. The cubic root of 1688743141 is about 1190.8430673395.

The spelling of 1688743141 in words is "one billion, six hundred eighty-eight million, seven hundred forty-three thousand, one hundred forty-one".