868631831 has 2 divisors, whose sum is σ = 868631832. Its totient is φ = 868631830.

The previous prime is 868631783. The next prime is 868631837. The reversal of 868631831 is 138136868.

868631831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 868631831 - 2⁶ = 868631767 is a prime.

It is a super-2 number, since 2×868631831² = 1509042515652825122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (868631837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434315915 + 434315916.

It is an arithmetic number, because the mean of its divisors is an integer number (434315916).

Almost surely, 2^868631831 is an apocalyptic number.

868631831 is a deficient number, since it is larger than the sum of its proper divisors (1).

868631831 is an equidigital number, since it uses as much as digits as its factorization.

868631831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 44.

The square root of 868631831 is about 29472.5606454546. The cubic root of 868631831 is about 954.1395833921.

The spelling of 868631831 in words is "eight hundred sixty-eight million, six hundred thirty-one thousand, eight hundred thirty-one".