1221061 has 2 divisors, whose sum is σ = 1221062. Its totient is φ = 1221060.

The previous prime is 1221049. The next prime is 1221079. The reversal of 1221061 is 1601221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1221025 + 36 = 1105^2 + 6^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221061 - 2⁵ = 1221029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610530 + 610531.

It is an arithmetic number, because the mean of its divisors is an integer number (610531).

2^1221061 is an apocalyptic number.

It is an amenable number.

1221061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221061 is an equidigital number, since it uses as much as digits as its factorization.

1221061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1221061 is about 1105.0162894727. The cubic root of 1221061 is about 106.8839397239.

Adding to 1221061 its reverse (1601221), we get a palindrome (2822282).

It can be divided in two parts, 12210 and 61, that multiplied together give a triangular number (744810 = T₁₂₂₀).

The spelling of 1221061 in words is "one million, two hundred twenty-one thousand, sixty-one".