11891471 has 2 divisors, whose sum is σ = 11891472. Its totient is φ = 11891470.

The previous prime is 11891461. The next prime is 11891497. The reversal of 11891471 is 17419811.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11891471 - 2¹⁸ = 11629327 is a prime.

It is a super-3 number, since 3×11891471³ (a number of 22 digits) contains 333 as substring.

It is equal to p₇₈₁₃₈₅ and since 11891471 and 781385 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11891431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5945735 + 5945736.

It is an arithmetic number, because the mean of its divisors is an integer number (5945736).

Almost surely, 2^11891471 is an apocalyptic number.

11891471 is a deficient number, since it is larger than the sum of its proper divisors (1).

11891471 is an equidigital number, since it uses as much as digits as its factorization.

11891471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 32.

The square root of 11891471 is about 3448.4012237557. The cubic root of 11891471 is about 228.2505645390.

The spelling of 11891471 in words is "eleven million, eight hundred ninety-one thousand, four hundred seventy-one".