545456821 has 16 divisors (see below), whose sum is σ = 672214144. Its totient is φ = 431002944.

The previous prime is 545456797. The next prime is 545456831. The reversal of 545456821 is 128654545.

It is a cyclic number.

It is not a de Polignac number, because 545456821 - 2⁹ = 545456309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545456831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74110 + ... + 81136.

It is an arithmetic number, because the mean of its divisors is an integer number (42013384).

Almost surely, 2^545456821 is an apocalyptic number.

It is an amenable number.

545456821 is a deficient number, since it is larger than the sum of its proper divisors (126757323).

545456821 is a wasteful number, since it uses less digits than its factorization.

545456821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7900.

The product of its digits is 192000, while the sum is 40.

The square root of 545456821 is about 23355.0170413126. The cubic root of 545456821 is about 817.0590768515.

The spelling of 545456821 in words is "five hundred forty-five million, four hundred fifty-six thousand, eight hundred twenty-one".