544821813 has 6 divisors (see below), whose sum is σ = 786964854. Its totient is φ = 363214536.

The previous prime is 544821793. The next prime is 544821829. The reversal of 544821813 is 318128445.

It can be written as a sum of positive squares in only one way, i.e., 339959844 + 204861969 = 18438^2 + 14313^2 .

It is not a de Polignac number, because 544821813 - 2⁶ = 544821749 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (544821863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30267870 + ... + 30267887.

It is an arithmetic number, because the mean of its divisors is an integer number (131160809).

Almost surely, 2^544821813 is an apocalyptic number.

It is an amenable number.

544821813 is a deficient number, since it is larger than the sum of its proper divisors (242143041).

544821813 is a wasteful number, since it uses less digits than its factorization.

544821813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60535763 (or 60535760 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 544821813 is about 23341.4184016310. The cubic root of 544821813 is about 816.7418867455.

It can be divided in two parts, 5448 and 21813, that added together give a triangular number (27261 = T₂₃₃).

The spelling of 544821813 in words is "five hundred forty-four million, eight hundred twenty-one thousand, eight hundred thirteen".