857500900031 has 2 divisors, whose sum is σ = 857500900032. Its totient is φ = 857500900030.

The previous prime is 857500900019. The next prime is 857500900049. The reversal of 857500900031 is 130009005758.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 857500900031 - 2¹⁴ = 857500883647 is a prime.

It is a super-2 number, since 2×857500900031² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857500900001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428750450015 + 428750450016.

It is an arithmetic number, because the mean of its divisors is an integer number (428750450016).

Almost surely, 2^857500900031 is an apocalyptic number.

857500900031 is a deficient number, since it is larger than the sum of its proper divisors (1).

857500900031 is an equidigital number, since it uses as much as digits as its factorization.

857500900031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 38.

Adding to 857500900031 its reverse (130009005758), we get a palindrome (987509905789).

The spelling of 857500900031 in words is "eight hundred fifty-seven billion, five hundred million, nine hundred thousand, thirty-one".