68100491 has 4 divisors (see below), whose sum is σ = 68223312. Its totient is φ = 67977672.

The previous prime is 68100479. The next prime is 68100517. The reversal of 68100491 is 19400186.

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 68100491 - 2²² = 63906187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68100191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60575 + ... + 61688.

It is an arithmetic number, because the mean of its divisors is an integer number (17055828).

Almost surely, 2^68100491 is an apocalyptic number.

68100491 is a deficient number, since it is larger than the sum of its proper divisors (122821).

68100491 is a wasteful number, since it uses less digits than its factorization.

68100491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122820.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 68100491 is about 8252.3021636389. The cubic root of 68100491 is about 408.3664747593.

The spelling of 68100491 in words is "sixty-eight million, one hundred thousand, four hundred ninety-one".