68899409 has 2 divisors, whose sum is σ = 68899410. Its totient is φ = 68899408.

The previous prime is 68899403. The next prime is 68899429. The reversal of 68899409 is 90499886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68890000 + 9409 = 8300^2 + 97^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68899409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68899403) 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, 34449704 + 34449705.

It is an arithmetic number, because the mean of its divisors is an integer number (34449705).

Almost surely, 2^68899409 is an apocalyptic number.

It is an amenable number.

68899409 is a deficient number, since it is larger than the sum of its proper divisors (1).

68899409 is an equidigital number, since it uses as much as digits as its factorization.

68899409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 53.

The square root of 68899409 is about 8300.5667878766. The cubic root of 68899409 is about 409.9571817271.

It can be divided in two parts, 6889 and 9409, that multiplied together give a square (64818601 = 8051²).

The spelling of 68899409 in words is "sixty-eight million, eight hundred ninety-nine thousand, four hundred nine".