68340581 has 2 divisors, whose sum is σ = 68340582. Its totient is φ = 68340580.

The previous prime is 68340551. The next prime is 68340593. The reversal of 68340581 is 18504386.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34409956 + 33930625 = 5866^2 + 5825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68340581 is a prime.

It is a super-2 number, since 2×68340581² = 9340870022835122, 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 (68340541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34170290 + 34170291.

It is an arithmetic number, because the mean of its divisors is an integer number (34170291).

Almost surely, 2^68340581 is an apocalyptic number.

It is an amenable number.

68340581 is a deficient number, since it is larger than the sum of its proper divisors (1).

68340581 is an equidigital number, since it uses as much as digits as its factorization.

68340581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 68340581 is about 8266.8362146591. The cubic root of 68340581 is about 408.8458139972.

It can be divided in two parts, 68340 and 581, that added together give a cube (68921 = 41³).

The spelling of 68340581 in words is "sixty-eight million, three hundred forty thousand, five hundred eighty-one".