68634191 has 4 divisors (see below), whose sum is σ = 68739000. Its totient is φ = 68529384.

The previous prime is 68634157. The next prime is 68634199. The reversal of 68634191 is 19143686.

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

It is a cyclic number.

It is not a de Polignac number, because 68634191 - 2¹⁰ = 68633167 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 (68634199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51416 + ... + 52733.

It is an arithmetic number, because the mean of its divisors is an integer number (17184750).

Almost surely, 2^68634191 is an apocalyptic number.

68634191 is a deficient number, since it is larger than the sum of its proper divisors (104809).

68634191 is a wasteful number, since it uses less digits than its factorization.

68634191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104808.

The product of its digits is 31104, while the sum is 38.

The square root of 68634191 is about 8284.5754870120. The cubic root of 68634191 is about 409.4304823195.

The spelling of 68634191 in words is "sixty-eight million, six hundred thirty-four thousand, one hundred ninety-one".