1119821 has 2 divisors, whose sum is σ = 1119822. Its totient is φ = 1119820.

The previous prime is 1119817. The next prime is 1119823. The reversal of 1119821 is 1289111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 855625 + 264196 = 925^2 + 514^2 .

It is an emirp because it is prime and its reverse (1289111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1119821 - 2² = 1119817 is a prime.

Together with 1119823, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1119823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 559910 + 559911.

It is an arithmetic number, because the mean of its divisors is an integer number (559911).

2^1119821 is an apocalyptic number.

It is an amenable number.

1119821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1119821 is an equidigital number, since it uses as much as digits as its factorization.

1119821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 23.

The square root of 1119821 is about 1058.2159514957. The cubic root of 1119821 is about 103.8443492634.

The spelling of 1119821 in words is "one million, one hundred nineteen thousand, eight hundred twenty-one".