56421543 has 4 divisors (see below), whose sum is σ = 75228728. Its totient is φ = 37614360.

The previous prime is 56421503. The next prime is 56421557. The reversal of 56421543 is 34512465.

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

It is not a de Polignac number, because 56421543 - 2¹² = 56417447 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56421543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56421503) 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, 9403588 + ... + 9403593.

It is an arithmetic number, because the mean of its divisors is an integer number (18807182).

Almost surely, 2^56421543 is an apocalyptic number.

56421543 is a deficient number, since it is larger than the sum of its proper divisors (18807185).

56421543 is a wasteful number, since it uses less digits than its factorization.

56421543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18807184.

The product of its digits is 14400, while the sum is 30.

The square root of 56421543 is about 7511.4274941585. The cubic root of 56421543 is about 383.5438172758.

The spelling of 56421543 in words is "fifty-six million, four hundred twenty-one thousand, five hundred forty-three".