545511021 has 16 divisors (see below), whose sum is σ = 795735360. Its totient is φ = 329669120.

The previous prime is 545511019. The next prime is 545511053. The reversal of 545511021 is 120115545.

It is not a de Polignac number, because 545511021 - 2¹ = 545511019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 545510982 and 545511000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545511821) 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, 11766 + ... + 35063.

It is an arithmetic number, because the mean of its divisors is an integer number (49733460).

Almost surely, 2^545511021 is an apocalyptic number.

It is an amenable number.

545511021 is a deficient number, since it is larger than the sum of its proper divisors (250224339).

545511021 is a wasteful number, since it uses less digits than its factorization.

545511021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47196.

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 545511021 is about 23356.1773627450. The cubic root of 545511021 is about 817.0861386546.

Adding to 545511021 its reverse (120115545), we get a palindrome (665626566).

It can be divided in two parts, 545 and 511021, that added together give a triangular number (511566 = T₁₀₁₁).

The spelling of 545511021 in words is "five hundred forty-five million, five hundred eleven thousand, twenty-one".