856285231031 has 2 divisors, whose sum is σ = 856285231032. Its totient is φ = 856285231030.

The previous prime is 856285230971. The next prime is 856285231063. The reversal of 856285231031 is 130132582658.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 856285231031 - 2⁶ = 856285230967 is a prime.

It is a super-2 number, since 2×856285231031² (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 (856285231631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428142615515 + 428142615516.

It is an arithmetic number, because the mean of its divisors is an integer number (428142615516).

Almost surely, 2^856285231031 is an apocalyptic number.

856285231031 is a deficient number, since it is larger than the sum of its proper divisors (1).

856285231031 is an equidigital number, since it uses as much as digits as its factorization.

856285231031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 345600, while the sum is 44.

The spelling of 856285231031 in words is "eight hundred fifty-six billion, two hundred eighty-five million, two hundred thirty-one thousand, thirty-one".