1312773191 has 4 divisors (see below), whose sum is σ = 1313055984. Its totient is φ = 1312490400.

The previous prime is 1312773157. The next prime is 1312773221. The reversal of 1312773191 is 1913772131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1913772131 = 19 ⋅100724849.

It is a cyclic number.

It is not a de Polignac number, because 1312773191 - 2²⁶ = 1245664327 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 (1312773391) 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, 134315 + ... + 143756.

It is an arithmetic number, because the mean of its divisors is an integer number (328263996).

Almost surely, 2^1312773191 is an apocalyptic number.

1312773191 is a deficient number, since it is larger than the sum of its proper divisors (282793).

1312773191 is an equidigital number, since it uses as much as digits as its factorization.

1312773191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282792.

The product of its digits is 7938, while the sum is 35.

The square root of 1312773191 is about 36232.2120633008. The cubic root of 1312773191 is about 1094.9557444775.

The spelling of 1312773191 in words is "one billion, three hundred twelve million, seven hundred seventy-three thousand, one hundred ninety-one".