68144969 has 2 divisors, whose sum is σ = 68144970. Its totient is φ = 68144968.

The previous prime is 68144953. The next prime is 68144977. The reversal of 68144969 is 96944186.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60637369 + 7507600 = 7787^2 + 2740^2 .

It is a cyclic number.

It is not a de Polignac number, because 68144969 - 2⁴ = 68144953 is a prime.

It is a super-2 number, since 2×68144969² = 9287473600021922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (68144939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34072484 + 34072485.

It is an arithmetic number, because the mean of its divisors is an integer number (34072485).

Almost surely, 2^68144969 is an apocalyptic number.

It is an amenable number.

68144969 is a deficient number, since it is larger than the sum of its proper divisors (1).

68144969 is an equidigital number, since it uses as much as digits as its factorization.

68144969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 47.

The square root of 68144969 is about 8254.9966081156. The cubic root of 68144969 is about 408.4553599295.

The spelling of 68144969 in words is "sixty-eight million, one hundred forty-four thousand, nine hundred sixty-nine".