68051309 has 2 divisors, whose sum is σ = 68051310. Its totient is φ = 68051308.

The previous prime is 68051281. The next prime is 68051317. The reversal of 68051309 is 90315086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38316100 + 29735209 = 6190^2 + 5453^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68051309 is a prime.

It is a super-2 number, since 2×68051309² = 9261961313226962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68051329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34025654 + 34025655.

It is an arithmetic number, because the mean of its divisors is an integer number (34025655).

Almost surely, 2^68051309 is an apocalyptic number.

It is an amenable number.

68051309 is a deficient number, since it is larger than the sum of its proper divisors (1).

68051309 is an equidigital number, since it uses as much as digits as its factorization.

68051309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 68051309 is about 8249.3217296939. The cubic root of 68051309 is about 408.2681440104.

The spelling of 68051309 in words is "sixty-eight million, fifty-one thousand, three hundred nine".