1920236909 has 2 divisors, whose sum is σ = 1920236910. Its totient is φ = 1920236908.

The previous prime is 1920236897. The next prime is 1920236917. The reversal of 1920236909 is 9096320291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1778983684 + 141253225 = 42178^2 + 11885^2 .

It is an emirp because it is prime and its reverse (9096320291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1920236909 - 2⁴ = 1920236893 is a prime.

It is a super-3 number, since 3×1920236909³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1920236009) 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, 960118454 + 960118455.

It is an arithmetic number, because the mean of its divisors is an integer number (960118455).

Almost surely, 2^1920236909 is an apocalyptic number.

It is an amenable number.

1920236909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920236909 is an equidigital number, since it uses as much as digits as its factorization.

1920236909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 1920236909 is about 43820.5078587640. The cubic root of 1920236909 is about 1242.9441205115.

The spelling of 1920236909 in words is "one billion, nine hundred twenty million, two hundred thirty-six thousand, nine hundred nine".