1669249741 has 2 divisors, whose sum is σ = 1669249742. Its totient is φ = 1669249740.

The previous prime is 1669249717. The next prime is 1669249819. The reversal of 1669249741 is 1479429661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1380419716 + 288830025 = 37154^2 + 16995^2 .

It is a cyclic number.

It is not a de Polignac number, because 1669249741 - 2⁷ = 1669249613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1669249711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834624870 + 834624871.

It is an arithmetic number, because the mean of its divisors is an integer number (834624871).

Almost surely, 2^1669249741 is an apocalyptic number.

It is an amenable number.

1669249741 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669249741 is an equidigital number, since it uses as much as digits as its factorization.

1669249741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 49.

The square root of 1669249741 is about 40856.4528685494. The cubic root of 1669249741 is about 1186.2432999881.

The spelling of 1669249741 in words is "one billion, six hundred sixty-nine million, two hundred forty-nine thousand, seven hundred forty-one".