68750621 has 2 divisors, whose sum is σ = 68750622. Its totient is φ = 68750620.

The previous prime is 68750579. The next prime is 68750659. The reversal of 68750621 is 12605786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65383396 + 3367225 = 8086^2 + 1835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68750621 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68750021) 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 as a sum of consecutive naturals, namely, 34375310 + 34375311.

It is an arithmetic number, because the mean of its divisors is an integer number (34375311).

Almost surely, 2^68750621 is an apocalyptic number.

It is an amenable number.

68750621 is a deficient number, since it is larger than the sum of its proper divisors (1).

68750621 is an equidigital number, since it uses as much as digits as its factorization.

68750621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 68750621 is about 8291.5994235129. The cubic root of 68750621 is about 409.6618687475.

The spelling of 68750621 in words is "sixty-eight million, seven hundred fifty thousand, six hundred twenty-one".