1311947 has 12 divisors (see below), whose sum is σ = 1625040. Its totient is φ = 1037088.

The previous prime is 1311923. The next prime is 1311967. The reversal of 1311947 is 7491131.

It is not a de Polignac number, because 1311947 - 2⁸ = 1311691 is a prime.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 629 + ... + 1737.

It is an arithmetic number, because the mean of its divisors is an integer number (135420).

2^1311947 is an apocalyptic number.

1311947 is a deficient number, since it is larger than the sum of its proper divisors (313093).

1311947 is a wasteful number, since it uses less digits than its factorization.

1311947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142 (or 1129 counting only the distinct ones).

The product of its digits is 756, while the sum is 26.

The square root of 1311947 is about 1145.4025493249. The cubic root of 1311947 is about 109.4725993588.

The spelling of 1311947 in words is "one million, three hundred eleven thousand, nine hundred forty-seven".