2028857491 has 2 divisors, whose sum is σ = 2028857492. Its totient is φ = 2028857490.

The previous prime is 2028857477. The next prime is 2028857513. The reversal of 2028857491 is 1947588202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2028857491 - 2¹¹ = 2028855443 is a prime.

It is not a weakly prime, because it can be changed into another prime (2028857591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1014428745 + 1014428746.

It is an arithmetic number, because the mean of its divisors is an integer number (1014428746).

Almost surely, 2^2028857491 is an apocalyptic number.

2028857491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2028857491 is an equidigital number, since it uses as much as digits as its factorization.

2028857491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 322560, while the sum is 46.

The square root of 2028857491 is about 45042.8406186821. The cubic root of 2028857491 is about 1265.9518300950.

The spelling of 2028857491 in words is "two billion, twenty-eight million, eight hundred fifty-seven thousand, four hundred ninety-one".