1831021 has 2 divisors, whose sum is σ = 1831022. Its totient is φ = 1831020.

The previous prime is 1831013. The next prime is 1831033. The reversal of 1831021 is 1201381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1716100 + 114921 = 1310^2 + 339^2 .

It is an emirp because it is prime and its reverse (1201381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1831021 - 2³ = 1831013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1830986 and 1831004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1831001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 915510 + 915511.

It is an arithmetic number, because the mean of its divisors is an integer number (915511).

2^1831021 is an apocalyptic number.

It is an amenable number.

1831021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1831021 is an equidigital number, since it uses as much as digits as its factorization.

1831021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1831021 is about 1353.1522456841. The cubic root of 1831021 is about 122.3388635193.

The spelling of 1831021 in words is "one million, eight hundred thirty-one thousand, twenty-one".