68690137 has 2 divisors, whose sum is σ = 68690138. Its totient is φ = 68690136.

The previous prime is 68690123. The next prime is 68690161. The reversal of 68690137 is 73109686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52722121 + 15968016 = 7261^2 + 3996^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68690137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68690137.

It is not a weakly prime, because it can be changed into another prime (68690197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34345068 + 34345069.

It is an arithmetic number, because the mean of its divisors is an integer number (34345069).

Almost surely, 2^68690137 is an apocalyptic number.

It is an amenable number.

68690137 is a deficient number, since it is larger than the sum of its proper divisors (1).

68690137 is an equidigital number, since it uses as much as digits as its factorization.

68690137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 68690137 is about 8287.9513150114. The cubic root of 68690137 is about 409.5416988839.

The spelling of 68690137 in words is "sixty-eight million, six hundred ninety thousand, one hundred thirty-seven".