545221381 has 8 divisors (see below), whose sum is σ = 572981024. Its totient is φ = 518147280.

The previous prime is 545221367. The next prime is 545221409. The reversal of 545221381 is 183122545.

545221381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 545221381 - 2¹¹ = 545219333 is a prime.

It is a super-2 number, since 2×545221381² = 594532708599094322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545221351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169755 + ... + 172936.

It is an arithmetic number, because the mean of its divisors is an integer number (71622628).

Almost surely, 2^545221381 is an apocalyptic number.

It is an amenable number.

545221381 is a deficient number, since it is larger than the sum of its proper divisors (27759643).

545221381 is a wasteful number, since it uses less digits than its factorization.

545221381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342771.

The product of its digits is 9600, while the sum is 31.

The square root of 545221381 is about 23349.9760385316. The cubic root of 545221381 is about 816.9415019637.

The spelling of 545221381 in words is "five hundred forty-five million, two hundred twenty-one thousand, three hundred eighty-one".