1255505543 has 4 divisors (see below), whose sum is σ = 1257138960. Its totient is φ = 1253872128.

The previous prime is 1255505519. The next prime is 1255505551. The reversal of 1255505543 is 3455055521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1255505543 - 2¹⁴ = 1255489159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255505593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 815555 + ... + 817092.

It is an arithmetic number, because the mean of its divisors is an integer number (314284740).

Almost surely, 2^1255505543 is an apocalyptic number.

1255505543 is a deficient number, since it is larger than the sum of its proper divisors (1633417).

1255505543 is an equidigital number, since it uses as much as digits as its factorization.

1255505543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633416.

The product of its (nonzero) digits is 75000, while the sum is 35.

The square root of 1255505543 is about 35433.1136509339. The cubic root of 1255505543 is about 1078.7965398371.

The spelling of 1255505543 in words is "one billion, two hundred fifty-five million, five hundred five thousand, five hundred forty-three".