545725021 has 4 divisors (see below), whose sum is σ = 545952672. Its totient is φ = 545497372.

The previous prime is 545725013. The next prime is 545725051. The reversal of 545725021 is 120527545.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 545725021 - 2³ = 545725013 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545725051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110191 + ... + 115036.

It is an arithmetic number, because the mean of its divisors is an integer number (136488168).

Almost surely, 2^545725021 is an apocalyptic number.

It is an amenable number.

545725021 is a deficient number, since it is larger than the sum of its proper divisors (227651).

545725021 is a wasteful number, since it uses less digits than its factorization.

545725021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227650.

The product of its (nonzero) digits is 14000, while the sum is 31.

The square root of 545725021 is about 23360.7581426631. The cubic root of 545725021 is about 817.1929703329.

The spelling of 545725021 in words is "five hundred forty-five million, seven hundred twenty-five thousand, twenty-one".