1669731841 has 4 divisors (see below), whose sum is σ = 1670130900. Its totient is φ = 1669332784.

The previous prime is 1669731829. The next prime is 1669731853. The reversal of 1669731841 is 1481379661.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1669731829) and next prime (1669731853).

It can be written as a sum of positive squares in 2 ways, for example, as 1464669441 + 205062400 = 38271^2 + 14320^2 .

It is a cyclic number.

It is not a de Polignac number, because 1669731841 - 2¹⁷ = 1669600769 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1669731791 and 1669731800.

It is not an unprimeable number, because it can be changed into a prime (1669731821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193186 + ... + 201643.

It is an arithmetic number, because the mean of its divisors is an integer number (417532725).

Almost surely, 2^1669731841 is an apocalyptic number.

It is an amenable number.

1669731841 is a deficient number, since it is larger than the sum of its proper divisors (399059).

1669731841 is an equidigital number, since it uses as much as digits as its factorization.

1669731841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399058.

The product of its digits is 217728, while the sum is 46.

The square root of 1669731841 is about 40862.3523674299. The cubic root of 1669731841 is about 1186.3574895815.

The spelling of 1669731841 in words is "one billion, six hundred sixty-nine million, seven hundred thirty-one thousand, eight hundred forty-one".