1310391 has 8 divisors (see below), whose sum is σ = 1941360. Its totient is φ = 873576.

The previous prime is 1310389. The next prime is 1310399. The reversal of 1310391 is 1930131.

It is not a de Polignac number, because 1310391 - 2¹ = 1310389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1310399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24240 + ... + 24293.

It is an arithmetic number, because the mean of its divisors is an integer number (242670).

2^1310391 is an apocalyptic number.

1310391 is a deficient number, since it is larger than the sum of its proper divisors (630969).

1310391 is an equidigital number, since it uses as much as digits as its factorization.

1310391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48542 (or 48536 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 18.

The square root of 1310391 is about 1144.7231106254. The cubic root of 1310391 is about 109.4293032116.

It can be divided in two parts, 13 and 10391, that added together give a square (10404 = 102²).

The spelling of 1310391 in words is "one million, three hundred ten thousand, three hundred ninety-one".