55181543 has 2 divisors, whose sum is σ = 55181544. Its totient is φ = 55181542.

The previous prime is 55181537. The next prime is 55181557. The reversal of 55181543 is 34518155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55181543 - 2⁴ = 55181527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55181563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27590771 + 27590772.

It is an arithmetic number, because the mean of its divisors is an integer number (27590772).

Almost surely, 2^55181543 is an apocalyptic number.

55181543 is a deficient number, since it is larger than the sum of its proper divisors (1).

55181543 is an equidigital number, since it uses as much as digits as its factorization.

55181543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12000, while the sum is 32.

The square root of 55181543 is about 7428.4280302094. The cubic root of 55181543 is about 380.7132104211.

Adding to 55181543 its reverse (34518155), we get a palindrome (89699698).

The spelling of 55181543 in words is "fifty-five million, one hundred eighty-one thousand, five hundred forty-three".