2091781427 has 2 divisors, whose sum is σ = 2091781428. Its totient is φ = 2091781426.

The previous prime is 2091781423. The next prime is 2091781441. The reversal of 2091781427 is 7241871902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2091781427 - 2² = 2091781423 is a prime.

It is not a weakly prime, because it can be changed into another prime (2091781423) 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, 1045890713 + 1045890714.

It is an arithmetic number, because the mean of its divisors is an integer number (1045890714).

Almost surely, 2^2091781427 is an apocalyptic number.

2091781427 is a deficient number, since it is larger than the sum of its proper divisors (1).

2091781427 is an equidigital number, since it uses as much as digits as its factorization.

2091781427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 2091781427 is about 45735.9970592093. The cubic root of 2091781427 is about 1278.9064200819.

The spelling of 2091781427 in words is "two billion, ninety-one million, seven hundred eighty-one thousand, four hundred twenty-seven".