1220811 has 8 divisors (see below), whose sum is σ = 1680384. Its totient is φ = 787560.

The previous prime is 1220803. The next prime is 1220819. The reversal of 1220811 is 1180221.

It is an interprime number because it is at equal distance from previous prime (1220803) and next prime (1220819).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1220811 - 2³ = 1220803 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1220819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6471 + ... + 6656.

It is an arithmetic number, because the mean of its divisors is an integer number (210048).

2^1220811 is an apocalyptic number.

1220811 is a deficient number, since it is larger than the sum of its proper divisors (459573).

1220811 is a wasteful number, since it uses less digits than its factorization.

1220811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13161.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 1220811 is about 1104.9031631777. The cubic root of 1220811 is about 106.8766447543.

The spelling of 1220811 in words is "one million, two hundred twenty thousand, eight hundred eleven".