55511543 has 2 divisors, whose sum is σ = 55511544. Its totient is φ = 55511542.

The previous prime is 55511537. The next prime is 55511557. The reversal of 55511543 is 34511555.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55511543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55511503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27755771 + 27755772.

It is an arithmetic number, because the mean of its divisors is an integer number (27755772).

Almost surely, 2^55511543 is an apocalyptic number.

55511543 is a deficient number, since it is larger than the sum of its proper divisors (1).

55511543 is an equidigital number, since it uses as much as digits as its factorization.

55511543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7500, while the sum is 29.

The square root of 55511543 is about 7450.6068880327. The cubic root of 55511543 is about 381.4706239652.

The spelling of 55511543 in words is "fifty-five million, five hundred eleven thousand, five hundred forty-three".