68613191 has 4 divisors (see below), whose sum is σ = 68938584. Its totient is φ = 68287800.

The previous prime is 68613187. The next prime is 68613197. The reversal of 68613191 is 19131686.

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 68613191 - 2² = 68613187 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 (68613197) 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, 162380 + ... + 162801.

It is an arithmetic number, because the mean of its divisors is an integer number (17234646).

Almost surely, 2^68613191 is an apocalyptic number.

68613191 is a deficient number, since it is larger than the sum of its proper divisors (325393).

68613191 is a wasteful number, since it uses less digits than its factorization.

68613191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325392.

The product of its digits is 7776, while the sum is 35.

The square root of 68613191 is about 8283.3079744749. The cubic root of 68613191 is about 409.3887202519.

The spelling of 68613191 in words is "sixty-eight million, six hundred thirteen thousand, one hundred ninety-one".