55555543 has 2 divisors, whose sum is σ = 55555544. Its totient is φ = 55555542.

The previous prime is 55555531. The next prime is 55555547. The reversal of 55555543 is 34555555.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55555543 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55555547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27777771 + 27777772.

It is an arithmetic number, because the mean of its divisors is an integer number (27777772).

Almost surely, 2^55555543 is an apocalyptic number.

55555543 is a deficient number, since it is larger than the sum of its proper divisors (1).

55555543 is an equidigital number, since it uses as much as digits as its factorization.

55555543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 187500, while the sum is 37.

The square root of 55555543 is about 7453.5590827470. The cubic root of 55555543 is about 381.5713854394.

The spelling of 55555543 in words is "fifty-five million, five hundred fifty-five thousand, five hundred forty-three".