68540929 has 2 divisors, whose sum is σ = 68540930. Its totient is φ = 68540928.

The previous prime is 68540921. The next prime is 68540939. The reversal of 68540929 is 92904586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55472704 + 13068225 = 7448^2 + 3615^2 .

It is a cyclic number.

It is not a de Polignac number, because 68540929 - 2³ = 68540921 is a prime.

It is not a weakly prime, because it can be changed into another prime (68540921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34270464 + 34270465.

It is an arithmetic number, because the mean of its divisors is an integer number (34270465).

Almost surely, 2^68540929 is an apocalyptic number.

It is an amenable number.

68540929 is a deficient number, since it is larger than the sum of its proper divisors (1).

68540929 is an equidigital number, since it uses as much as digits as its factorization.

68540929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 68540929 is about 8278.9449207009. The cubic root of 68540929 is about 409.2449498444.

It can be divided in two parts, 685 and 40929, that added together give a palindrome (41614).

The spelling of 68540929 in words is "sixty-eight million, five hundred forty thousand, nine hundred twenty-nine".