1920222391 has 2 divisors, whose sum is σ = 1920222392. Its totient is φ = 1920222390.

The previous prime is 1920222373. The next prime is 1920222397. The reversal of 1920222391 is 1932220291.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1920222391 - 2⁹ = 1920221879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1920222397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960111195 + 960111196.

It is an arithmetic number, because the mean of its divisors is an integer number (960111196).

Almost surely, 2^1920222391 is an apocalyptic number.

1920222391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920222391 is an equidigital number, since it uses as much as digits as its factorization.

1920222391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 1920222391 is about 43820.3422054187. The cubic root of 1920222391 is about 1242.9409880667.

The spelling of 1920222391 in words is "one billion, nine hundred twenty million, two hundred twenty-two thousand, three hundred ninety-one".