68245591 has 4 divisors (see below), whose sum is σ = 68743872. Its totient is φ = 67747312.

The previous prime is 68245589. The next prime is 68245603. The reversal of 68245591 is 19554286.

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 68245591 - 2¹ = 68245589 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68245561) 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, 248935 + ... + 249208.

It is an arithmetic number, because the mean of its divisors is an integer number (17185968).

Almost surely, 2^68245591 is an apocalyptic number.

68245591 is a deficient number, since it is larger than the sum of its proper divisors (498281).

68245591 is a wasteful number, since it uses less digits than its factorization.

68245591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498280.

The product of its digits is 86400, while the sum is 40.

The square root of 68245591 is about 8261.0889718003. The cubic root of 68245591 is about 408.6563010670.

The spelling of 68245591 in words is "sixty-eight million, two hundred forty-five thousand, five hundred ninety-one".