68561149 has 2 divisors, whose sum is σ = 68561150. Its totient is φ = 68561148.

The previous prime is 68561147. The next prime is 68561159. The reversal of 68561149 is 94116586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61308900 + 7252249 = 7830^2 + 2693^2 .

It is a cyclic number.

It is not a de Polignac number, because 68561149 - 2¹ = 68561147 is a prime.

Together with 68561147, 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 (68561147) 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, 34280574 + 34280575.

It is an arithmetic number, because the mean of its divisors is an integer number (34280575).

Almost surely, 2^68561149 is an apocalyptic number.

It is an amenable number.

68561149 is a deficient number, since it is larger than the sum of its proper divisors (1).

68561149 is an equidigital number, since it uses as much as digits as its factorization.

68561149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 40.

The square root of 68561149 is about 8280.1660007514. The cubic root of 68561149 is about 409.2851891556.

The spelling of 68561149 in words is "sixty-eight million, five hundred sixty-one thousand, one hundred forty-nine".