6858686831 has 2 divisors, whose sum is σ = 6858686832. Its totient is φ = 6858686830.

The previous prime is 6858686801. The next prime is 6858686851. The reversal of 6858686831 is 1386868586.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6858686831 - 2²² = 6854492527 is a prime.

It is a super-2 number, since 2×6858686831² = 94083170091465645122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6858686801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3429343415 + 3429343416.

It is an arithmetic number, because the mean of its divisors is an integer number (3429343416).

Almost surely, 2^6858686831 is an apocalyptic number.

6858686831 is a deficient number, since it is larger than the sum of its proper divisors (1).

6858686831 is an equidigital number, since it uses as much as digits as its factorization.

6858686831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13271040, while the sum is 59.

The square root of 6858686831 is about 82817.1892242184. The cubic root of 6858686831 is about 1899.9710827547.

The spelling of 6858686831 in words is "six billion, eight hundred fifty-eight million, six hundred eighty-six thousand, eight hundred thirty-one".