11947471 has 2 divisors, whose sum is σ = 11947472. Its totient is φ = 11947470.

The previous prime is 11947433. The next prime is 11947483. The reversal of 11947471 is 17474911.

It is a strong prime.

It is an emirp because it is prime and its reverse (17474911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11947471 - 2⁷ = 11947343 is a prime.

It is a super-3 number, since 3×11947471³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11941471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5973735 + 5973736.

It is an arithmetic number, because the mean of its divisors is an integer number (5973736).

Almost surely, 2^11947471 is an apocalyptic number.

11947471 is a deficient number, since it is larger than the sum of its proper divisors (1).

11947471 is an equidigital number, since it uses as much as digits as its factorization.

11947471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 34.

The square root of 11947471 is about 3456.5113915623. The cubic root of 11947471 is about 228.6083004691.

The spelling of 11947471 in words is "eleven million, nine hundred forty-seven thousand, four hundred seventy-one".