68551309 has 2 divisors, whose sum is σ = 68551310. Its totient is φ = 68551308.

The previous prime is 68551283. The next prime is 68551319. The reversal of 68551309 is 90315586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45941284 + 22610025 = 6778^2 + 4755^2 .

It is a cyclic number.

It is not a de Polignac number, because 68551309 - 2¹³ = 68543117 is a prime.

It is a super-2 number, since 2×68551309² = 9398563931226962, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68551319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34275654 + 34275655.

It is an arithmetic number, because the mean of its divisors is an integer number (34275655).

Almost surely, 2^68551309 is an apocalyptic number.

It is an amenable number.

68551309 is a deficient number, since it is larger than the sum of its proper divisors (1).

68551309 is an equidigital number, since it uses as much as digits as its factorization.

68551309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 68551309 is about 8279.5717884441. The cubic root of 68551309 is about 409.2656078086.

The spelling of 68551309 in words is "sixty-eight million, five hundred fifty-one thousand, three hundred nine".