1021799 has 2 divisors, whose sum is σ = 1021800. Its totient is φ = 1021798.

The previous prime is 1021793. The next prime is 1021807. The reversal of 1021799 is 9971201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1021799 - 2¹² = 1017703 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510899 + 510900.

It is an arithmetic number, because the mean of its divisors is an integer number (510900).

2^1021799 is an apocalyptic number.

1021799 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021799 is an equidigital number, since it uses as much as digits as its factorization.

1021799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 1021799 is about 1010.8407391869. The cubic root of 1021799 is about 100.7214164019.

The spelling of 1021799 in words is "one million, twenty-one thousand, seven hundred ninety-nine".