2872723297921 has 9 divisors (see below), whose sum is σ = 2877543218691. Its totient is φ = 2867911445592.

The previous prime is 2872723297907. The next prime is 2872723297979. The reversal of 2872723297921 is 1297923272782.

The square root of 2872723297921 is 1694911.

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., 165921802225 + 2706801495696 = 407335^2 + 1645236^2 .

It is not a de Polignac number, because 2872723297921 - 2⁷ = 2872723297793 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 2872723297921.

It is not an unprimeable number, because it can be changed into a prime (2872723297901) 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, 1445758090 + ... + 1445760076.

It is an arithmetic number, because the mean of its divisors is an integer number (319727024299).

Almost surely, 2^{2872723297921} is an apocalyptic number.

2872723297921 is the 1694911-st square number.

2872723297921 is the 847456-th centered octagonal number.

It is an amenable number.

2872723297921 is a deficient number, since it is larger than the sum of its proper divisors (4819920770).

2872723297921 is an frugal number, since it uses more digits than its factorization.

2872723297921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5680 (or 2840 counting only the distinct ones).

The product of its digits is 21337344, while the sum is 61.

The spelling of 2872723297921 in words is "two trillion, eight hundred seventy-two billion, seven hundred twenty-three million, two hundred ninety-seven thousand, nine hundred twenty-one".