857031 has 16 divisors (see below), whose sum is σ = 1342464. Its totient is φ = 476064.

The previous prime is 857029. The next prime is 857039. The reversal of 857031 is 130758.

It is not a de Polignac number, because 857031 - 2¹ = 857029 is a prime.

It is a super-2 number, since 2×857031² = 1469004269922, which contains 22 as substring.

857031 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 856992 and 857010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226 + ... + 1328.

It is an arithmetic number, because the mean of its divisors is an integer number (83904).

2⁸⁵⁷⁰³¹ is an apocalyptic number.

857031 is a deficient number, since it is larger than the sum of its proper divisors (485433).

857031 is a wasteful number, since it uses less digits than its factorization.

857031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 857031 is about 925.7596880400. The cubic root of 857031 is about 94.9872928525.

Adding to 857031 its reverse (130758), we get a palindrome (987789).

The spelling of 857031 in words is "eight hundred fifty-seven thousand, thirty-one".