1071821 has 2 divisors, whose sum is σ = 1071822. Its totient is φ = 1071820.

The previous prime is 1071817. The next prime is 1071841. The reversal of 1071821 is 1281701.

It is an a-pointer prime, because the next prime (1071841) can be obtained adding 1071821 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 990025 + 81796 = 995^2 + 286^2 .

It is a cyclic number.

It is not a de Polignac number, because 1071821 - 2² = 1071817 is a prime.

It is a super-2 number, since 2×1071821² = 2297600512082, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1071793 and 1071802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1071841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 535910 + 535911.

It is an arithmetic number, because the mean of its divisors is an integer number (535911).

2^1071821 is an apocalyptic number.

It is an amenable number.

1071821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1071821 is an equidigital number, since it uses as much as digits as its factorization.

1071821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 1071821 is about 1035.2878826684. The cubic root of 1071821 is about 102.3389022022.

The spelling of 1071821 in words is "one million, seventy-one thousand, eight hundred twenty-one".