1220771 has 4 divisors (see below), whose sum is σ = 1273872. Its totient is φ = 1167672.

The previous prime is 1220761. The next prime is 1220773. The reversal of 1220771 is 1770221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1220771 - 2¹⁰ = 1219747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26516 + ... + 26561.

It is an arithmetic number, because the mean of its divisors is an integer number (318468).

2^1220771 is an apocalyptic number.

1220771 is a deficient number, since it is larger than the sum of its proper divisors (53101).

1220771 is an equidigital number, since it uses as much as digits as its factorization.

1220771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53100.

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 1220771 is about 1104.8850618956. The cubic root of 1220771 is about 106.8754774667.

Adding to 1220771 its reverse (1770221), we get a palindrome (2990992).

It can be divided in two parts, 1220 and 771, that added together give a palindrome (1991).

The spelling of 1220771 in words is "one million, two hundred twenty thousand, seven hundred seventy-one".