1273220045 has 4 divisors (see below), whose sum is σ = 1527864060. Its totient is φ = 1018576032.

The previous prime is 1273220041. The next prime is 1273220051. The reversal of 1273220045 is 5400223721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5400223721 = 151 ⋅35763071.

It can be written as a sum of positive squares in 2 ways, for example, as 859545124 + 413674921 = 29318^2 + 20339^2 .

It is a cyclic number.

It is not a de Polignac number, because 1273220045 - 2² = 1273220041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1273219996 and 1273220023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1273220041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127322000 + ... + 127322009.

It is an arithmetic number, because the mean of its divisors is an integer number (381966015).

Almost surely, 2^1273220045 is an apocalyptic number.

It is an amenable number.

1273220045 is a deficient number, since it is larger than the sum of its proper divisors (254644015).

1273220045 is an equidigital number, since it uses as much as digits as its factorization.

1273220045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254644014.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 1273220045 is about 35682.2090823985. The cubic root of 1273220045 is about 1083.8466071649.

Adding to 1273220045 its reverse (5400223721), we get a palindrome (6673443766).

The spelling of 1273220045 in words is "one billion, two hundred seventy-three million, two hundred twenty thousand, forty-five".