1273281013 has 4 divisors (see below), whose sum is σ = 1273892620. Its totient is φ = 1272669408.

The previous prime is 1273281001. The next prime is 1273281049. The reversal of 1273281013 is 3101823721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3101823721 = 257 ⋅12069353.

It can be written as a sum of positive squares in 2 ways, for example, as 557290449 + 715990564 = 23607^2 + 26758^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1273281013 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 (1273281913) 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, 302670 + ... + 306847.

It is an arithmetic number, because the mean of its divisors is an integer number (318473155).

Almost surely, 2^1273281013 is an apocalyptic number.

It is an amenable number.

1273281013 is a deficient number, since it is larger than the sum of its proper divisors (611607).

1273281013 is an equidigital number, since it uses as much as digits as its factorization.

1273281013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611606.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 1273281013 is about 35683.0633914747. The cubic root of 1273281013 is about 1083.8639068467.

The spelling of 1273281013 in words is "one billion, two hundred seventy-three million, two hundred eighty-one thousand, thirteen".