1421555543 has 4 divisors (see below), whose sum is σ = 1426097568. Its totient is φ = 1417013520.

The previous prime is 1421555519. The next prime is 1421555563. The reversal of 1421555543 is 3455551241.

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 1421555543 - 2⁶ = 1421555479 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 (1421555563) 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 3 ways as a sum of consecutive naturals, for example, 2270543 + ... + 2271168.

It is an arithmetic number, because the mean of its divisors is an integer number (356524392).

Almost surely, 2^1421555543 is an apocalyptic number.

1421555543 is a deficient number, since it is larger than the sum of its proper divisors (4542025).

1421555543 is an equidigital number, since it uses as much as digits as its factorization.

1421555543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4542024.

The product of its digits is 60000, while the sum is 35.

The square root of 1421555543 is about 37703.5216259702. The cubic root of 1421555543 is about 1124.4011411574.

The spelling of 1421555543 in words is "one billion, four hundred twenty-one million, five hundred fifty-five thousand, five hundred forty-three".