1553144543 has 4 divisors (see below), whose sum is σ = 1553234688. Its totient is φ = 1553054400.

The previous prime is 1553144539. The next prime is 1553144573. The reversal of 1553144543 is 3454413551.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3454413551 = 5849 ⋅590599.

It is a cyclic number.

It is not a de Polignac number, because 1553144543 - 2² = 1553144539 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 (1553144513) 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, 10271 + ... + 56672.

It is an arithmetic number, because the mean of its divisors is an integer number (388308672).

Almost surely, 2^1553144543 is an apocalyptic number.

1553144543 is a deficient number, since it is larger than the sum of its proper divisors (90145).

1553144543 is an equidigital number, since it uses as much as digits as its factorization.

1553144543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90144.

The product of its digits is 72000, while the sum is 35.

The square root of 1553144543 is about 39409.9548718341. The cubic root of 1553144543 is about 1158.0766141890.

The spelling of 1553144543 in words is "one billion, five hundred fifty-three million, one hundred forty-four thousand, five hundred forty-three".