68631749 has 2 divisors, whose sum is σ = 68631750. Its totient is φ = 68631748.

The previous prime is 68631697. The next prime is 68631751. The reversal of 68631749 is 94713686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67354849 + 1276900 = 8207^2 + 1130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68631749 is a prime.

Together with 68631751, 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 (68631779) 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, 34315874 + 34315875.

It is an arithmetic number, because the mean of its divisors is an integer number (34315875).

Almost surely, 2^68631749 is an apocalyptic number.

It is an amenable number.

68631749 is a deficient number, since it is larger than the sum of its proper divisors (1).

68631749 is an equidigital number, since it uses as much as digits as its factorization.

68631749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 44.

The square root of 68631749 is about 8284.4281033756. The cubic root of 68631749 is about 409.4256264254.

The spelling of 68631749 in words is "sixty-eight million, six hundred thirty-one thousand, seven hundred forty-nine".