1311771 has 16 divisors (see below), whose sum is σ = 1879200. Its totient is φ = 813824.

The previous prime is 1311769. The next prime is 1311773. The reversal of 1311771 is 1771131.

It is an interprime number because it is at equal distance from previous prime (1311769) and next prime (1311773).

It is not a de Polignac number, because 1311771 - 2¹ = 1311769 is a prime.

1311771 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1311773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14695 + ... + 14783.

It is an arithmetic number, because the mean of its divisors is an integer number (117450).

2^1311771 is an apocalyptic number.

1311771 is a deficient number, since it is larger than the sum of its proper divisors (567429).

1311771 is an frugal number, since it uses more digits than its factorization.

1311771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143 (or 109 counting only the distinct ones).

The product of its digits is 147, while the sum is 21.

The square root of 1311771 is about 1145.3257178637. The cubic root of 1311771 is about 109.4677038259.

The spelling of 1311771 in words is "one million, three hundred eleven thousand, seven hundred seventy-one".