11391471 has 36 divisors (see below), whose sum is σ = 20623512. Its totient is φ = 6005664.

The previous prime is 11391451. The next prime is 11391473. The reversal of 11391471 is 17419311.

It is not a de Polignac number, because 11391471 - 2¹³ = 11383279 is a prime.

It is a super-3 number, since 3×11391471³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11391473) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4740 + ... + 6726.

Almost surely, 2^11391471 is an apocalyptic number.

11391471 is a deficient number, since it is larger than the sum of its proper divisors (9232041).

11391471 is a wasteful number, since it uses less digits than its factorization.

11391471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2020 (or 2010 counting only the distinct ones).

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

The square root of 11391471 is about 3375.1253310062. The cubic root of 11391471 is about 225.0055702325.

The spelling of 11391471 in words is "eleven million, three hundred ninety-one thousand, four hundred seventy-one".