5531541781 has 2 divisors, whose sum is σ = 5531541782. Its totient is φ = 5531541780.

The previous prime is 5531541749. The next prime is 5531541893. The reversal of 5531541781 is 1871451355.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4895241156 + 636300625 = 69966^2 + 25225^2 .

It is a cyclic number.

It is not a de Polignac number, because 5531541781 - 2⁵ = 5531541749 is a prime.

It is a super-2 number, since 2×5531541781² = 61195908949897303922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5531541731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2765770890 + 2765770891.

It is an arithmetic number, because the mean of its divisors is an integer number (2765770891).

Almost surely, 2^5531541781 is an apocalyptic number.

It is an amenable number.

5531541781 is a deficient number, since it is larger than the sum of its proper divisors (1).

5531541781 is an equidigital number, since it uses as much as digits as its factorization.

5531541781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84000, while the sum is 40.

The square root of 5531541781 is about 74374.3354995525. The cubic root of 5531541781 is about 1768.5420853537.

The spelling of 5531541781 in words is "five billion, five hundred thirty-one million, five hundred forty-one thousand, seven hundred eighty-one".