2085172857 has 12 divisors (see below), whose sum is σ = 3012360624. Its totient is φ = 1389910200.

The previous prime is 2085172853. The next prime is 2085172889. The reversal of 2085172857 is 7582715802.

It is not a de Polignac number, because 2085172857 - 2² = 2085172853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2085172853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71482 + ... + 96332.

It is an arithmetic number, because the mean of its divisors is an integer number (251030052).

Almost surely, 2^2085172857 is an apocalyptic number.

It is an amenable number.

2085172857 is a deficient number, since it is larger than the sum of its proper divisors (927187767).

2085172857 is a wasteful number, since it uses less digits than its factorization.

2085172857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34180 (or 34177 counting only the distinct ones).

The product of its (nonzero) digits is 313600, while the sum is 45.

The square root of 2085172857 is about 45663.6929846897. The cubic root of 2085172857 is about 1277.5581818955.

The spelling of 2085172857 in words is "two billion, eighty-five million, one hundred seventy-two thousand, eight hundred fifty-seven".