1555720543 has 12 divisors (see below), whose sum is σ = 1704908520. Its totient is φ = 1418735136.

The previous prime is 1555720531. The next prime is 1555720553. The reversal of 1555720543 is 3450275551.

It is not a de Polignac number, because 1555720543 - 2⁵ = 1555720511 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 (1555720553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41428 + ... + 69481.

It is an arithmetic number, because the mean of its divisors is an integer number (142075710).

Almost surely, 2^1555720543 is an apocalyptic number.

1555720543 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1555720543 is a deficient number, since it is larger than the sum of its proper divisors (149187977).

1555720543 is a wasteful number, since it uses less digits than its factorization.

1555720543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111018 (or 111005 counting only the distinct ones).

The product of its (nonzero) digits is 105000, while the sum is 37.

The square root of 1555720543 is about 39442.6234294830. The cubic root of 1555720543 is about 1158.7165111868.

It can be divided in two parts, 15557 and 20543, that added together give a square (36100 = 190²).

The spelling of 1555720543 in words is "one billion, five hundred fifty-five million, seven hundred twenty thousand, five hundred forty-three".