1381311 has 12 divisors (see below), whose sum is σ = 2082288. Its totient is φ = 880704.

The previous prime is 1381307. The next prime is 1381313. The reversal of 1381311 is 1131831.

It is a happy number.

It is not a de Polignac number, because 1381311 - 2² = 1381307 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3130 + ... + 3543.

It is an arithmetic number, because the mean of its divisors is an integer number (173524).

2^1381311 is an apocalyptic number.

1381311 is a deficient number, since it is larger than the sum of its proper divisors (700977).

1381311 is a wasteful number, since it uses less digits than its factorization.

1381311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6702 (or 6699 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 1381311 is about 1175.2918786412. The cubic root of 1381311 is about 111.3688726426.

It can be divided in two parts, 13813 and 11, that added together give a cube (13824 = 24³).

The spelling of 1381311 in words is "one million, three hundred eighty-one thousand, three hundred eleven".