2800927721 has 2 divisors, whose sum is σ = 2800927722. Its totient is φ = 2800927720.

The previous prime is 2800927691. The next prime is 2800927733. The reversal of 2800927721 is 1277290082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2794602496 + 6325225 = 52864^2 + 2515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2800927721 is a prime.

It is not a weakly prime, because it can be changed into another prime (2800927771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1400463860 + 1400463861.

It is an arithmetic number, because the mean of its divisors is an integer number (1400463861).

Almost surely, 2^2800927721 is an apocalyptic number.

It is an amenable number.

2800927721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2800927721 is an equidigital number, since it uses as much as digits as its factorization.

2800927721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 2800927721 is about 52923.7916347648. The cubic root of 2800927721 is about 1409.6153941533.

The spelling of 2800927721 in words is "two billion, eight hundred million, nine hundred twenty-seven thousand, seven hundred twenty-one".