864856123031 has 2 divisors, whose sum is σ = 864856123032. Its totient is φ = 864856123030.

The previous prime is 864856122997. The next prime is 864856123069. The reversal of 864856123031 is 130321658468.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-864856123031 is a prime.

It is a super-2 number, since 2×864856123031² (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 (864856123531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432428061515 + 432428061516.

It is an arithmetic number, because the mean of its divisors is an integer number (432428061516).

Almost surely, 2^864856123031 is an apocalyptic number.

864856123031 is a deficient number, since it is larger than the sum of its proper divisors (1).

864856123031 is an equidigital number, since it uses as much as digits as its factorization.

864856123031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 829440, while the sum is 47.

The spelling of 864856123031 in words is "eight hundred sixty-four billion, eight hundred fifty-six million, one hundred twenty-three thousand, thirty-one".