1920091091 has 2 divisors, whose sum is σ = 1920091092. Its totient is φ = 1920091090.

The previous prime is 1920091081. The next prime is 1920091093. The reversal of 1920091091 is 1901900291.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1920091091 is a prime.

Together with 1920091093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1920091093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960045545 + 960045546.

It is an arithmetic number, because the mean of its divisors is an integer number (960045546).

Almost surely, 2^1920091091 is an apocalyptic number.

1920091091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920091091 is an equidigital number, since it uses as much as digits as its factorization.

1920091091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 32.

The square root of 1920091091 is about 43818.8440171577. The cubic root of 1920091091 is about 1242.9126576899.

The spelling of 1920091091 in words is "one billion, nine hundred twenty million, ninety-one thousand, ninety-one".