2811720257 has 2 divisors, whose sum is σ = 2811720258. Its totient is φ = 2811720256.

The previous prime is 2811720251. The next prime is 2811720283. The reversal of 2811720257 is 7520271182.

2811720257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1784133121 + 1027587136 = 42239^2 + 32056^2 .

It is a cyclic number.

It is not a de Polignac number, because 2811720257 - 2⁶ = 2811720193 is a prime.

It is not a weakly prime, because it can be changed into another prime (2811720251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1405860128 + 1405860129.

It is an arithmetic number, because the mean of its divisors is an integer number (1405860129).

Almost surely, 2^2811720257 is an apocalyptic number.

It is an amenable number.

2811720257 is a deficient number, since it is larger than the sum of its proper divisors (1).

2811720257 is an equidigital number, since it uses as much as digits as its factorization.

2811720257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15680, while the sum is 35.

The square root of 2811720257 is about 53025.6565918801. The cubic root of 2811720257 is about 1411.4235839301.

The spelling of 2811720257 in words is "two billion, eight hundred eleven million, seven hundred twenty thousand, two hundred fifty-seven".