68020861 has 2 divisors, whose sum is σ = 68020862. Its totient is φ = 68020860.

The previous prime is 68020853. The next prime is 68020871. The reversal of 68020861 is 16802086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53436100 + 14584761 = 7310^2 + 3819^2 .

It is a cyclic number.

It is not a de Polignac number, because 68020861 - 2³ = 68020853 is a prime.

It is equal to p_4008487 and since 68020861 and 4008487 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68020801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34010430 + 34010431.

It is an arithmetic number, because the mean of its divisors is an integer number (34010431).

Almost surely, 2^68020861 is an apocalyptic number.

It is an amenable number.

68020861 is a deficient number, since it is larger than the sum of its proper divisors (1).

68020861 is an equidigital number, since it uses as much as digits as its factorization.

68020861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 68020861 is about 8247.4760381586. The cubic root of 68020861 is about 408.2072448493.

The spelling of 68020861 in words is "sixty-eight million, twenty thousand, eight hundred sixty-one".