68517919 has 2 divisors, whose sum is σ = 68517920. Its totient is φ = 68517918.

The previous prime is 68517913. The next prime is 68517931. The reversal of 68517919 is 91971586.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68517919 - 2⁵ = 68517887 is a prime.

It is a super-2 number, since 2×68517919² = 9389410448181122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68517913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34258959 + 34258960.

It is an arithmetic number, because the mean of its divisors is an integer number (34258960).

Almost surely, 2^68517919 is an apocalyptic number.

68517919 is a deficient number, since it is larger than the sum of its proper divisors (1).

68517919 is an equidigital number, since it uses as much as digits as its factorization.

68517919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 46.

The square root of 68517919 is about 8277.5551342169. Note that the first 3 decimals coincide. The cubic root of 68517919 is about 409.1991485964.

The spelling of 68517919 in words is "sixty-eight million, five hundred seventeen thousand, nine hundred nineteen".