210905057 has 6 divisors (see below), whose sum is σ = 231821394. Its totient is φ = 191731760.

The previous prime is 210905053. The next prime is 210905083. The reversal of 210905057 is 750509012.

It can be written as a sum of positive squares in only one way, i.e., 158357056 + 52548001 = 12584^2 + 7249^2 .

It is not a de Polignac number, because 210905057 - 2² = 210905053 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210905053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 871388 + ... + 871629.

It is an arithmetic number, because the mean of its divisors is an integer number (38636899).

Almost surely, 2^210905057 is an apocalyptic number.

It is an amenable number.

210905057 is a deficient number, since it is larger than the sum of its proper divisors (20916337).

210905057 is a wasteful number, since it uses less digits than its factorization.

210905057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1743039 (or 1743028 counting only the distinct ones).

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 210905057 is about 14522.5706057846. The cubic root of 210905057 is about 595.2448743738.

The spelling of 210905057 in words is "two hundred ten million, nine hundred five thousand, fifty-seven".