1321769 has 2 divisors, whose sum is σ = 1321770. Its totient is φ = 1321768.

The previous prime is 1321763. The next prime is 1321813. The reversal of 1321769 is 9671231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 739600 + 582169 = 860^2 + 763^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321769 - 2⁴ = 1321753 is a prime.

It is a super-2 number, since 2×1321769² = 3494146578722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1321763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660884 + 660885.

It is an arithmetic number, because the mean of its divisors is an integer number (660885).

2^1321769 is an apocalyptic number.

It is an amenable number.

1321769 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321769 is an equidigital number, since it uses as much as digits as its factorization.

1321769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 29.

The square root of 1321769 is about 1149.6821299820. The cubic root of 1321769 is about 109.7451123198.

The spelling of 1321769 in words is "one million, three hundred twenty-one thousand, seven hundred sixty-nine".