1543055551 has 4 divisors (see below), whose sum is σ = 1543163832. Its totient is φ = 1542947272.

The previous prime is 1543055513. The next prime is 1543055593. The reversal of 1543055551 is 1555503451.

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: 1555503451 = 17 ⋅91500203.

It is a cyclic number.

It is not a de Polignac number, because 1543055551 - 2¹⁵ = 1543022783 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 (1543055351) 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, 28816 + ... + 62581.

It is an arithmetic number, because the mean of its divisors is an integer number (385790958).

Almost surely, 2^1543055551 is an apocalyptic number.

1543055551 is a deficient number, since it is larger than the sum of its proper divisors (108281).

1543055551 is an equidigital number, since it uses as much as digits as its factorization.

1543055551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108280.

The product of its (nonzero) digits is 37500, while the sum is 34.

The square root of 1543055551 is about 39281.7457733233. The cubic root of 1543055551 is about 1155.5636014257.

The spelling of 1543055551 in words is "one billion, five hundred forty-three million, fifty-five thousand, five hundred fifty-one".