544251721 has 4 divisors (see below), whose sum is σ = 586117252. Its totient is φ = 502386192.

The previous prime is 544251689. The next prime is 544251761. The reversal of 544251721 is 127152445.

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 153636025 + 390615696 = 12395^2 + 19764^2 .

It is a cyclic number.

It is not a de Polignac number, because 544251721 - 2⁵ = 544251689 is a prime.

It is a super-2 number, since 2×544251721² = 592419871622923682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (544251761) 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 3 ways as a sum of consecutive naturals, for example, 20932746 + ... + 20932771.

It is an arithmetic number, because the mean of its divisors is an integer number (146529313).

Almost surely, 2^544251721 is an apocalyptic number.

It is an amenable number.

544251721 is a deficient number, since it is larger than the sum of its proper divisors (41865531).

544251721 is a wasteful number, since it uses less digits than its factorization.

544251721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41865530.

The product of its digits is 11200, while the sum is 31.

The square root of 544251721 is about 23329.2031797059. The cubic root of 544251721 is about 816.4569125246.

The spelling of 544251721 in words is "five hundred forty-four million, two hundred fifty-one thousand, seven hundred twenty-one".