1688172313 has 2 divisors, whose sum is σ = 1688172314. Its totient is φ = 1688172312.

The previous prime is 1688172293. The next prime is 1688172337. The reversal of 1688172313 is 3132718861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1610256384 + 77915929 = 40128^2 + 8827^2 .

It is a cyclic number.

It is not a de Polignac number, because 1688172313 - 2⁵ = 1688172281 is a prime.

It is not a weakly prime, because it can be changed into another prime (1688172413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844086156 + 844086157.

It is an arithmetic number, because the mean of its divisors is an integer number (844086157).

Almost surely, 2^1688172313 is an apocalyptic number.

It is an amenable number.

1688172313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688172313 is an equidigital number, since it uses as much as digits as its factorization.

1688172313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 40.

The square root of 1688172313 is about 41087.3741312340. The cubic root of 1688172313 is about 1190.7088761856.

The spelling of 1688172313 in words is "one billion, six hundred eighty-eight million, one hundred seventy-two thousand, three hundred thirteen".