1220742773 has 2 divisors, whose sum is σ = 1220742774. Its totient is φ = 1220742772.

The previous prime is 1220742751. The next prime is 1220742793. The reversal of 1220742773 is 3772470221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1209439729 + 11303044 = 34777^2 + 3362^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220742773 - 2¹⁸ = 1220480629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220742793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610371386 + 610371387.

It is an arithmetic number, because the mean of its divisors is an integer number (610371387).

Almost surely, 2^1220742773 is an apocalyptic number.

It is an amenable number.

1220742773 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220742773 is an equidigital number, since it uses as much as digits as its factorization.

1220742773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32928, while the sum is 35.

The square root of 1220742773 is about 34939.1295398154. The cubic root of 1220742773 is about 1068.7465372572.

The spelling of 1220742773 in words is "one billion, two hundred twenty million, seven hundred forty-two thousand, seven hundred seventy-three".