1689133081 has 2 divisors, whose sum is σ = 1689133082. Its totient is φ = 1689133080.

The previous prime is 1689133031. The next prime is 1689133099. The reversal of 1689133081 is 1803319861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 935136400 + 753996681 = 30580^2 + 27459^2 .

It is a cyclic number.

It is not a de Polignac number, because 1689133081 - 2¹⁵ = 1689100313 is a prime.

It is a super-2 number, since 2×1689133081² = 5706341130657105122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1689133001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844566540 + 844566541.

It is an arithmetic number, because the mean of its divisors is an integer number (844566541).

Almost surely, 2^1689133081 is an apocalyptic number.

It is an amenable number.

1689133081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1689133081 is an equidigital number, since it uses as much as digits as its factorization.

1689133081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 1689133081 is about 41099.0642350893. The cubic root of 1689133081 is about 1190.9347176717.

The spelling of 1689133081 in words is "one billion, six hundred eighty-nine million, one hundred thirty-three thousand, eighty-one".