55315543 has 2 divisors, whose sum is σ = 55315544. Its totient is φ = 55315542.

The previous prime is 55315523. The next prime is 55315553. The reversal of 55315543 is 34551355.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55315543 - 2⁹ = 55315031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55315523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27657771 + 27657772.

It is an arithmetic number, because the mean of its divisors is an integer number (27657772).

Almost surely, 2^55315543 is an apocalyptic number.

55315543 is a deficient number, since it is larger than the sum of its proper divisors (1).

55315543 is an equidigital number, since it uses as much as digits as its factorization.

55315543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22500, while the sum is 31.

The square root of 55315543 is about 7437.4419661601. The cubic root of 55315543 is about 381.0211293890.

Adding to 55315543 its reverse (34551355), we get a palindrome (89866898).

The spelling of 55315543 in words is "fifty-five million, three hundred fifteen thousand, five hundred forty-three".