1221793 has 2 divisors, whose sum is σ = 1221794. Its totient is φ = 1221792.

The previous prime is 1221791. The next prime is 1221811. The reversal of 1221793 is 3971221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1216609 + 5184 = 1103^2 + 72^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221793 - 2¹ = 1221791 is a prime.

Together with 1221791, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1221791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610896 + 610897.

It is an arithmetic number, because the mean of its divisors is an integer number (610897).

2^1221793 is an apocalyptic number.

It is an amenable number.

1221793 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221793 is an equidigital number, since it uses as much as digits as its factorization.

1221793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756, while the sum is 25.

The square root of 1221793 is about 1105.3474566850. The cubic root of 1221793 is about 106.9052936707.

The spelling of 1221793 in words is "one million, two hundred twenty-one thousand, seven hundred ninety-three".