1669042129 has 2 divisors, whose sum is σ = 1669042130. Its totient is φ = 1669042128.

The previous prime is 1669042073. The next prime is 1669042153. The reversal of 1669042129 is 9212409661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1668559104 + 483025 = 40848^2 + 695^2 .

It is a cyclic number.

It is not a de Polignac number, because 1669042129 - 2¹³ = 1669033937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1669042091 and 1669042100.

It is not a weakly prime, because it can be changed into another prime (1669042169) 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, 834521064 + 834521065.

It is an arithmetic number, because the mean of its divisors is an integer number (834521065).

Almost surely, 2^1669042129 is an apocalyptic number.

It is an amenable number.

1669042129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669042129 is an equidigital number, since it uses as much as digits as its factorization.

1669042129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 1669042129 is about 40853.9120403420. The cubic root of 1669042129 is about 1186.1941185008.

The spelling of 1669042129 in words is "one billion, six hundred sixty-nine million, forty-two thousand, one hundred twenty-nine".