1811421427 has 2 divisors, whose sum is σ = 1811421428. Its totient is φ = 1811421426.

The previous prime is 1811421401. The next prime is 1811421431. The reversal of 1811421427 is 7241241181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1811421427 - 2¹⁵ = 1811388659 is a prime.

It is not a weakly prime, because it can be changed into another prime (1811421727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 905710713 + 905710714.

It is an arithmetic number, because the mean of its divisors is an integer number (905710714).

Almost surely, 2^1811421427 is an apocalyptic number.

1811421427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1811421427 is an equidigital number, since it uses as much as digits as its factorization.

1811421427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3584, while the sum is 31.

The square root of 1811421427 is about 42560.7968322963. The cubic root of 1811421427 is about 1219.0078440316.

The spelling of 1811421427 in words is "one billion, eight hundred eleven million, four hundred twenty-one thousand, four hundred twenty-seven".