1221593 has 2 divisors, whose sum is σ = 1221594. Its totient is φ = 1221592.

The previous prime is 1221589. The next prime is 1221601. The reversal of 1221593 is 3951221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 851929 + 369664 = 923^2 + 608^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221593 - 2² = 1221589 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610796 + 610797.

It is an arithmetic number, because the mean of its divisors is an integer number (610797).

2^1221593 is an apocalyptic number.

It is an amenable number.

1221593 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221593 is an equidigital number, since it uses as much as digits as its factorization.

1221593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 23.

The square root of 1221593 is about 1105.2569836920. The cubic root of 1221593 is about 106.8994601060.

The spelling of 1221593 in words is "one million, two hundred twenty-one thousand, five hundred ninety-three".