1689638141 has 2 divisors, whose sum is σ = 1689638142. Its totient is φ = 1689638140.

The previous prime is 1689638129. The next prime is 1689638147. The reversal of 1689638141 is 1418369861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1133668900 + 555969241 = 33670^2 + 23579^2 .

It is a cyclic number.

It is not a de Polignac number, because 1689638141 - 2¹⁸ = 1689375997 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1689638147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844819070 + 844819071.

It is an arithmetic number, because the mean of its divisors is an integer number (844819071).

Almost surely, 2^1689638141 is an apocalyptic number.

It is an amenable number.

1689638141 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689638141 is an equidigital number, since it uses as much as digits as its factorization.

1689638141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 47.

The square root of 1689638141 is about 41105.2081979887. The cubic root of 1689638141 is about 1191.0534045009.

The spelling of 1689638141 in words is "one billion, six hundred eighty-nine million, six hundred thirty-eight thousand, one hundred forty-one".