6931198091 has 2 divisors, whose sum is σ = 6931198092. Its totient is φ = 6931198090.

The previous prime is 6931198069. The next prime is 6931198111. The reversal of 6931198091 is 1908911396.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6931198091 is a prime.

It is a super-3 number, since 3×6931198091³ (a number of 30 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (6931198031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3465599045 + 3465599046.

It is an arithmetic number, because the mean of its divisors is an integer number (3465599046).

Almost surely, 2^6931198091 is an apocalyptic number.

6931198091 is a deficient number, since it is larger than the sum of its proper divisors (1).

6931198091 is an equidigital number, since it uses as much as digits as its factorization.

6931198091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 47.

The square root of 6931198091 is about 83253.8172758463. The cubic root of 6931198091 is about 1906.6432356520.

The spelling of 6931198091 in words is "six billion, nine hundred thirty-one million, one hundred ninety-eight thousand, ninety-one".