857216031 has 16 divisors (see below), whose sum is σ = 1307948544. Its totient is φ = 489194784.

The previous prime is 857216021. The next prime is 857216053. The reversal of 857216031 is 130612758.

It is not a de Polignac number, because 857216031 - 2¹⁴ = 857199647 is a prime.

It is a super-2 number, since 2×857216031² = 1469638647606785922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 857215983 and 857216001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857216021) 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 15 ways as a sum of consecutive naturals, for example, 10171 + ... + 42636.

It is an arithmetic number, because the mean of its divisors is an integer number (81746784).

Almost surely, 2^857216031 is an apocalyptic number.

857216031 is a deficient number, since it is larger than the sum of its proper divisors (450732513).

857216031 is a wasteful number, since it uses less digits than its factorization.

857216031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53590.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 857216031 is about 29278.2518433051. The cubic root of 857216031 is about 949.9412820587.

Adding to 857216031 its reverse (130612758), we get a palindrome (987828789).

The spelling of 857216031 in words is "eight hundred fifty-seven million, two hundred sixteen thousand, thirty-one".