545845521 has 32 divisors (see below), whose sum is σ = 802851840. Its totient is φ = 327816000.

The previous prime is 545845519. The next prime is 545845549. The reversal of 545845521 is 125548545.

It is not a de Polignac number, because 545845521 - 2¹ = 545845519 is a prime.

It is a super-2 number, since 2×545845521² = 595894665591522882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 545845521.

It is not an unprimeable number, because it can be changed into a prime (545845021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 346666 + ... + 348236.

It is an arithmetic number, because the mean of its divisors is an integer number (25089120).

Almost surely, 2^545845521 is an apocalyptic number.

It is an amenable number.

545845521 is a deficient number, since it is larger than the sum of its proper divisors (257006319).

545845521 is a wasteful number, since it uses less digits than its factorization.

545845521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1797.

The product of its digits is 160000, while the sum is 39.

The square root of 545845521 is about 23363.3371118083. The cubic root of 545845521 is about 817.2531132634.

The spelling of 545845521 in words is "five hundred forty-five million, eight hundred forty-five thousand, five hundred twenty-one".