11311947 has 8 divisors (see below), whose sum is σ = 16758480. Its totient is φ = 7541280.

The previous prime is 11311939. The next prime is 11311961. The reversal of 11311947 is 74911311.

It is not a de Polignac number, because 11311947 - 2³ = 11311939 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 418961 = 11311947 / (1 + 1 + 3 + 1 + 1 + 9 + 4 + 7).

It is a self number, because there is not a number n which added to its sum of digits gives 11311947.

It is not an unprimeable number, because it can be changed into a prime (11311907) 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 7 ways as a sum of consecutive naturals, for example, 209454 + ... + 209507.

It is an arithmetic number, because the mean of its divisors is an integer number (2094810).

Almost surely, 2^11311947 is an apocalyptic number.

11311947 is a deficient number, since it is larger than the sum of its proper divisors (5446533).

11311947 is an equidigital number, since it uses as much as digits as its factorization.

11311947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418970 (or 418964 counting only the distinct ones).

The product of its digits is 756, while the sum is 27.

The square root of 11311947 is about 3363.3238024312. The cubic root of 11311947 is about 224.4807582016.

The spelling of 11311947 in words is "eleven million, three hundred eleven thousand, nine hundred forty-seven".