68115191 has 2 divisors, whose sum is σ = 68115192. Its totient is φ = 68115190.

The previous prime is 68115169. The next prime is 68115193. The reversal of 68115191 is 19151186.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68115191 is a prime.

It is a Sophie Germain prime.

Together with 68115193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68115193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34057595 + 34057596.

It is an arithmetic number, because the mean of its divisors is an integer number (34057596).

Almost surely, 2^68115191 is an apocalyptic number.

68115191 is a deficient number, since it is larger than the sum of its proper divisors (1).

68115191 is an equidigital number, since it uses as much as digits as its factorization.

68115191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 32.

The square root of 68115191 is about 8253.1927761322. The cubic root of 68115191 is about 408.3958556307.

The spelling of 68115191 in words is "sixty-eight million, one hundred fifteen thousand, one hundred ninety-one".