68412581 has 2 divisors, whose sum is σ = 68412582. Its totient is φ = 68412580.

The previous prime is 68412569. The next prime is 68412583. The reversal of 68412581 is 18521486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49350625 + 19061956 = 7025^2 + 4366^2 .

It is a cyclic number.

It is not a de Polignac number, because 68412581 - 2¹⁴ = 68396197 is a prime.

It is a super-2 number, since 2×68412581² = 9360562478163122, which contains 22 as substring.

Together with 68412583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68412583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34206290 + 34206291.

It is an arithmetic number, because the mean of its divisors is an integer number (34206291).

Almost surely, 2^68412581 is an apocalyptic number.

It is an amenable number.

68412581 is a deficient number, since it is larger than the sum of its proper divisors (1).

68412581 is an equidigital number, since it uses as much as digits as its factorization.

68412581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15360, while the sum is 35.

The square root of 68412581 is about 8271.1898176744. The cubic root of 68412581 is about 408.9893430030.

The spelling of 68412581 in words is "sixty-eight million, four hundred twelve thousand, five hundred eighty-one".