1220071 has 2 divisors, whose sum is σ = 1220072. Its totient is φ = 1220070.

The previous prime is 1220041. The next prime is 1220077. The reversal of 1220071 is 1700221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220071 is a prime.

1220071 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610035 + 610036.

It is an arithmetic number, because the mean of its divisors is an integer number (610036).

2^1220071 is an apocalyptic number.

1220071 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220071 is an equidigital number, since it uses as much as digits as its factorization.

1220071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 1220071 is about 1104.5682414410. The cubic root of 1220071 is about 106.8550458056.

Adding to 1220071 its reverse (1700221), we get a palindrome (2920292).

The spelling of 1220071 in words is "one million, two hundred twenty thousand, seventy-one".