6855199931 has 2 divisors, whose sum is σ = 6855199932. Its totient is φ = 6855199930.

The previous prime is 6855199919. The next prime is 6855199951. The reversal of 6855199931 is 1399915586.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6855199931 - 2¹⁸ = 6854937787 is a prime.

It is a super-2 number, since 2×6855199931² = 93987532187964809522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6855199951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3427599965 + 3427599966.

It is an arithmetic number, because the mean of its divisors is an integer number (3427599966).

Almost surely, 2^6855199931 is an apocalyptic number.

6855199931 is a deficient number, since it is larger than the sum of its proper divisors (1).

6855199931 is an equidigital number, since it uses as much as digits as its factorization.

6855199931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2624400, while the sum is 56.

The square root of 6855199931 is about 82796.1347588159. The cubic root of 6855199931 is about 1899.6490516163.

The spelling of 6855199931 in words is "six billion, eight hundred fifty-five million, one hundred ninety-nine thousand, nine hundred thirty-one".