5481891823 has 2 divisors, whose sum is σ = 5481891824. Its totient is φ = 5481891822.

The previous prime is 5481891817. The next prime is 5481891887. The reversal of 5481891823 is 3281981845.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5481891823 is a prime.

It is a super-2 number, since 2×5481891823² = 60102275918148526658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5481891803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2740945911 + 2740945912.

It is an arithmetic number, because the mean of its divisors is an integer number (2740945912).

Almost surely, 2^5481891823 is an apocalyptic number.

5481891823 is a deficient number, since it is larger than the sum of its proper divisors (1).

5481891823 is an equidigital number, since it uses as much as digits as its factorization.

5481891823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 552960, while the sum is 49.

The square root of 5481891823 is about 74039.7989124768. The cubic root of 5481891823 is about 1763.2348203876.

It can be divided in two parts, 54818 and 91823, that added together give a palindrome (146641).

The spelling of 5481891823 in words is "five billion, four hundred eighty-one million, eight hundred ninety-one thousand, eight hundred twenty-three".