11891481 has 16 divisors (see below), whose sum is σ = 18370944. Its totient is φ = 6701184.

The previous prime is 11891471. The next prime is 11891497. The reversal of 11891481 is 18419811.

It is not a de Polignac number, because 11891481 - 2⁹ = 11890969 is a prime.

It is a super-2 number, since 2×11891481² = 282814640746722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11891431) 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 15 ways as a sum of consecutive naturals, for example, 2346 + ... + 5411.

It is an arithmetic number, because the mean of its divisors is an integer number (1148184).

Almost surely, 2^11891481 is an apocalyptic number.

It is an amenable number.

11891481 is a deficient number, since it is larger than the sum of its proper divisors (6479463).

11891481 is an equidigital number, since it uses as much as digits as its factorization.

11891481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7840.

The product of its digits is 2304, while the sum is 33.

The square root of 11891481 is about 3448.4026737027. The cubic root of 11891481 is about 228.2506285205.

The spelling of 11891481 in words is "eleven million, eight hundred ninety-one thousand, four hundred eighty-one".