1243055797 has 4 divisors (see below), whose sum is σ = 1285919820. Its totient is φ = 1200191776.

The previous prime is 1243055789. The next prime is 1243055819. The reversal of 1243055797 is 7975503421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7975503421 = 1733 ⋅4602137.

It can be written as a sum of positive squares in 2 ways, for example, as 1067917041 + 175138756 = 32679^2 + 13234^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243055797 - 2³ = 1243055789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243055747) 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, 21431968 + ... + 21432025.

It is an arithmetic number, because the mean of its divisors is an integer number (321479955).

Almost surely, 2^1243055797 is an apocalyptic number.

It is an amenable number.

1243055797 is a deficient number, since it is larger than the sum of its proper divisors (42864023).

1243055797 is an equidigital number, since it uses as much as digits as its factorization.

1243055797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42864022.

The product of its (nonzero) digits is 264600, while the sum is 43.

The square root of 1243055797 is about 35256.9964262414. The cubic root of 1243055797 is about 1075.2188620905.

The spelling of 1243055797 in words is "one billion, two hundred forty-three million, fifty-five thousand, seven hundred ninety-seven".