545331421 has 4 divisors (see below), whose sum is σ = 550730844. Its totient is φ = 539932000.

The previous prime is 545331383. The next prime is 545331427. The reversal of 545331421 is 124133545.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 326705625 + 218625796 = 18075^2 + 14786^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-545331421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 545331421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545331427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2699560 + ... + 2699761.

It is an arithmetic number, because the mean of its divisors is an integer number (137682711).

Almost surely, 2^545331421 is an apocalyptic number.

It is an amenable number.

545331421 is a deficient number, since it is larger than the sum of its proper divisors (5399423).

545331421 is a wasteful number, since it uses less digits than its factorization.

545331421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5399422.

The product of its digits is 7200, while the sum is 28.

The square root of 545331421 is about 23352.3322389863. The cubic root of 545331421 is about 816.9964583532.

Adding to 545331421 its reverse (124133545), we get a palindrome (669464966).

The spelling of 545331421 in words is "five hundred forty-five million, three hundred thirty-one thousand, four hundred twenty-one".