68531413 has 2 divisors, whose sum is σ = 68531414. Its totient is φ = 68531412.

The previous prime is 68531399. The next prime is 68531431. The reversal of 68531413 is 31413586.

Together with next prime (68531431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55621764 + 12909649 = 7458^2 + 3593^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68531413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68531443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34265706 + 34265707.

It is an arithmetic number, because the mean of its divisors is an integer number (34265707).

Almost surely, 2^68531413 is an apocalyptic number.

It is an amenable number.

68531413 is a deficient number, since it is larger than the sum of its proper divisors (1).

68531413 is an equidigital number, since it uses as much as digits as its factorization.

68531413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 68531413 is about 8278.3701898381. The cubic root of 68531413 is about 409.2260095546.

Adding to 68531413 its reverse (31413586), we get a palindrome (99944999).

The spelling of 68531413 in words is "sixty-eight million, five hundred thirty-one thousand, four hundred thirteen".