68394257 has 2 divisors, whose sum is σ = 68394258. Its totient is φ = 68394256.

The previous prime is 68394251. The next prime is 68394283. The reversal of 68394257 is 75249386.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53640976 + 14753281 = 7324^2 + 3841^2 .

It is a cyclic number.

It is not a de Polignac number, because 68394257 - 2²⁶ = 1285393 is a prime.

It is a Chen prime.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (68394251) 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, 34197128 + 34197129.

It is an arithmetic number, because the mean of its divisors is an integer number (34197129).

Almost surely, 2^68394257 is an apocalyptic number.

It is an amenable number.

68394257 is a deficient number, since it is larger than the sum of its proper divisors (1).

68394257 is an equidigital number, since it uses as much as digits as its factorization.

68394257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 44.

The square root of 68394257 is about 8270.0820431239. The cubic root of 68394257 is about 408.9528244279.

The spelling of 68394257 in words is "sixty-eight million, three hundred ninety-four thousand, two hundred fifty-seven".