1273320361 has 4 divisors (see below), whose sum is σ = 1273409424. Its totient is φ = 1273231300.

The previous prime is 1273320337. The next prime is 1273320401. The reversal of 1273320361 is 1630233721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1630233721 = 23 ⋅70879727.

It is a cyclic number.

It is not a de Polignac number, because 1273320361 - 2¹³ = 1273312169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1273320311) 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 in 3 ways as a sum of consecutive naturals, for example, 17695 + ... + 53476.

It is an arithmetic number, because the mean of its divisors is an integer number (318352356).

Almost surely, 2^1273320361 is an apocalyptic number.

It is an amenable number.

1273320361 is a deficient number, since it is larger than the sum of its proper divisors (89063).

1273320361 is an equidigital number, since it uses as much as digits as its factorization.

1273320361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89062.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 1273320361 is about 35683.6147412226. The cubic root of 1273320361 is about 1083.8750715562.

The spelling of 1273320361 in words is "one billion, two hundred seventy-three million, three hundred twenty thousand, three hundred sixty-one".