1206721 has 2 divisors, whose sum is σ = 1206722. Its totient is φ = 1206720.

The previous prime is 1206713. The next prime is 1206731. The reversal of 1206721 is 1276021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 876096 + 330625 = 936^2 + 575^2 .

It is a cyclic number.

It is not a de Polignac number, because 1206721 - 2³ = 1206713 is a prime.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (1206701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 603360 + 603361.

It is an arithmetic number, because the mean of its divisors is an integer number (603361).

2^1206721 is an apocalyptic number.

It is an amenable number.

1206721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1206721 is an equidigital number, since it uses as much as digits as its factorization.

1206721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 1206721 is about 1098.5085343319. The cubic root of 1206721 is about 106.4638801300.

The spelling of 1206721 in words is "one million, two hundred six thousand, seven hundred twenty-one".