1920805669 has 2 divisors, whose sum is σ = 1920805670. Its totient is φ = 1920805668.

The previous prime is 1920805619. The next prime is 1920805687. The reversal of 1920805669 is 9665080291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1691676900 + 229128769 = 41130^2 + 15137^2 .

It is a cyclic number.

It is not a de Polignac number, because 1920805669 - 2¹⁹ = 1920281381 is a prime.

It is a super-2 number, since 2×1920805669² = 7378988836125075122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1920805619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960402834 + 960402835.

It is an arithmetic number, because the mean of its divisors is an integer number (960402835).

Almost surely, 2^1920805669 is an apocalyptic number.

It is an amenable number.

1920805669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920805669 is an equidigital number, since it uses as much as digits as its factorization.

1920805669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 1920805669 is about 43826.9970337919. The cubic root of 1920805669 is about 1243.0668253558.

The spelling of 1920805669 in words is "one billion, nine hundred twenty million, eight hundred five thousand, six hundred sixty-nine".