68251217 has 4 divisors (see below), whose sum is σ = 68427060. Its totient is φ = 68075376.

The previous prime is 68251213. The next prime is 68251219. The reversal of 68251217 is 71215286.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71215286 = 2 ⋅35607643.

It can be written as a sum of positive squares in 2 ways, for example, as 46730896 + 21520321 = 6836^2 + 4639^2 .

It is a cyclic number.

It is not a de Polignac number, because 68251217 - 2² = 68251213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68251213) 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, 87338 + ... + 88115.

It is an arithmetic number, because the mean of its divisors is an integer number (17106765).

Almost surely, 2^68251217 is an apocalyptic number.

It is an amenable number.

68251217 is a deficient number, since it is larger than the sum of its proper divisors (175843).

68251217 is a wasteful number, since it uses less digits than its factorization.

68251217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175842.

The product of its digits is 6720, while the sum is 32.

The square root of 68251217 is about 8261.4294767915. The cubic root of 68251217 is about 408.6675303012.

The spelling of 68251217 in words is "sixty-eight million, two hundred fifty-one thousand, two hundred seventeen".