545821457 has 4 divisors (see below), whose sum is σ = 546161460. Its totient is φ = 545481456.

The previous prime is 545821429. The next prime is 545821459. The reversal of 545821457 is 754128545.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 754128545 = 5 ⋅150825709.

It can be written as a sum of positive squares in 2 ways, for example, as 394260736 + 151560721 = 19856^2 + 12311^2 .

It is a cyclic number.

It is not a de Polignac number, because 545821457 - 2¹⁰ = 545820433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (545821459) 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, 167582 + ... + 170807.

It is an arithmetic number, because the mean of its divisors is an integer number (136540365).

Almost surely, 2^545821457 is an apocalyptic number.

It is an amenable number.

545821457 is a deficient number, since it is larger than the sum of its proper divisors (340003).

545821457 is a wasteful number, since it uses less digits than its factorization.

545821457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340002.

The product of its digits is 224000, while the sum is 41.

The square root of 545821457 is about 23362.8221112091. The cubic root of 545821457 is about 817.2411033527.

The spelling of 545821457 in words is "five hundred forty-five million, eight hundred twenty-one thousand, four hundred fifty-seven".