546728626921 has 9 divisors (see below), whose sum is σ = 548255319831. Its totient is φ = 545206179672.

The previous prime is 546728626883. The next prime is 546728626931. The reversal of 546728626921 is 129626827645.

It is a happy number.

The square root of 546728626921 is 739411.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 109590792025 + 437137834896 = 331045^2 + 661164^2 .

It is not a de Polignac number, because 546728626921 - 2¹³ = 546728618729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (546728626931) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 342346495 + ... + 342348091.

It is an arithmetic number, because the mean of its divisors is an integer number (60917257759).

Almost surely, 2^546728626921 is an apocalyptic number.

546728626921 is the 739411-st square number.

546728626921 is the 369706-th centered octagonal number.

It is an amenable number.

546728626921 is a deficient number, since it is larger than the sum of its proper divisors (1526692910).

546728626921 is an frugal number, since it uses more digits than its factorization.

546728626921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4120 (or 2060 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 58.

The spelling of 546728626921 in words is "five hundred forty-six billion, seven hundred twenty-eight million, six hundred twenty-six thousand, nine hundred twenty-one".