1311220073 has 2 divisors, whose sum is σ = 1311220074. Its totient is φ = 1311220072.

The previous prime is 1311220069. The next prime is 1311220103. The reversal of 1311220073 is 3700221131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1305593689 + 5626384 = 36133^2 + 2372^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311220073 - 2² = 1311220069 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1311220063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655610036 + 655610037.

It is an arithmetic number, because the mean of its divisors is an integer number (655610037).

Almost surely, 2^1311220073 is an apocalyptic number.

It is an amenable number.

1311220073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311220073 is an equidigital number, since it uses as much as digits as its factorization.

1311220073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 1311220073 is about 36210.7728859797. The cubic root of 1311220073 is about 1094.5237666927.

The spelling of 1311220073 in words is "one billion, three hundred eleven million, two hundred twenty thousand, seventy-three".