1220111773 has 2 divisors, whose sum is σ = 1220111774. Its totient is φ = 1220111772.

The previous prime is 1220111729. The next prime is 1220111801. The reversal of 1220111773 is 3771110221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 817788409 + 402323364 = 28597^2 + 20058^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220111773 - 2⁹ = 1220111261 is a prime.

It is a super-2 number, since 2×1220111773² = 2977345477226407058, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220111173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610055886 + 610055887.

It is an arithmetic number, because the mean of its divisors is an integer number (610055887).

Almost surely, 2^1220111773 is an apocalyptic number.

It is an amenable number.

1220111773 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220111773 is an equidigital number, since it uses as much as digits as its factorization.

1220111773 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 588, while the sum is 25.

The square root of 1220111773 is about 34930.0983823407. The cubic root of 1220111773 is about 1068.5623610577.

Adding to 1220111773 its reverse (3771110221), we get a palindrome (4991221994).

The spelling of 1220111773 in words is "one billion, two hundred twenty million, one hundred eleven thousand, seven hundred seventy-three".