68491191 has 4 divisors (see below), whose sum is σ = 91321592. Its totient is φ = 45660792.

The previous prime is 68491169. The next prime is 68491237. The reversal of 68491191 is 19119486.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 68491191 - 2¹⁰ = 68490167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68491091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11415196 + ... + 11415201.

It is an arithmetic number, because the mean of its divisors is an integer number (22830398).

Almost surely, 2^68491191 is an apocalyptic number.

68491191 is a deficient number, since it is larger than the sum of its proper divisors (22830401).

68491191 is a wasteful number, since it uses less digits than its factorization.

68491191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22830400.

The product of its digits is 15552, while the sum is 39.

The square root of 68491191 is about 8275.9404903612. The cubic root of 68491191 is about 409.1459338197.

The spelling of 68491191 in words is "sixty-eight million, four hundred ninety-one thousand, one hundred ninety-one".