1920697769 has 2 divisors, whose sum is σ = 1920697770. Its totient is φ = 1920697768.

The previous prime is 1920697717. The next prime is 1920697781. The reversal of 1920697769 is 9677960291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 975750169 + 944947600 = 31237^2 + 30740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1920697769 is a prime.

It is a super-2 number, since 2×1920697769² = 7378159839683154722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1920607769) 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, 960348884 + 960348885.

It is an arithmetic number, because the mean of its divisors is an integer number (960348885).

Almost surely, 2^1920697769 is an apocalyptic number.

It is an amenable number.

1920697769 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920697769 is an equidigital number, since it uses as much as digits as its factorization.

1920697769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2571912, while the sum is 56.

The square root of 1920697769 is about 43825.7660400819. The cubic root of 1920697769 is about 1243.0435487651.

The spelling of 1920697769 in words is "one billion, nine hundred twenty million, six hundred ninety-seven thousand, seven hundred sixty-nine".