1099121 has 2 divisors, whose sum is σ = 1099122. Its totient is φ = 1099120.

The previous prime is 1099117. The next prime is 1099139. The reversal of 1099121 is 1219901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1079521 + 19600 = 1039^2 + 140^2 .

It is a cyclic number.

It is not a de Polignac number, because 1099121 - 2² = 1099117 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1099171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549560 + 549561.

It is an arithmetic number, because the mean of its divisors is an integer number (549561).

2^1099121 is an apocalyptic number.

It is an amenable number.

1099121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1099121 is an equidigital number, since it uses as much as digits as its factorization.

1099121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 1099121 is about 1048.3897176146. The cubic root of 1099121 is about 103.2005080299.

The spelling of 1099121 in words is "one million, ninety-nine thousand, one hundred twenty-one".