19812071 has 2 divisors, whose sum is σ = 19812072. Its totient is φ = 19812070.

The previous prime is 19812049. The next prime is 19812073. The reversal of 19812071 is 17021891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19812071 - 2¹⁸ = 19549927 is a prime.

Together with 19812073, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19812073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9906035 + 9906036.

It is an arithmetic number, because the mean of its divisors is an integer number (9906036).

Almost surely, 2^19812071 is an apocalyptic number.

19812071 is a deficient number, since it is larger than the sum of its proper divisors (1).

19812071 is an equidigital number, since it uses as much as digits as its factorization.

19812071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 19812071 is about 4451.0752633493. The cubic root of 19812071 is about 270.5888884144.

The spelling of 19812071 in words is "nineteen million, eight hundred twelve thousand, seventy-one".