68951909 has 4 divisors (see below), whose sum is σ = 74255916. Its totient is φ = 63647904.

The previous prime is 68951903. The next prime is 68951917. The reversal of 68951909 is 90915986.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10857025 + 58094884 = 3295^2 + 7622^2 .

It is a cyclic number.

It is not a de Polignac number, because 68951909 - 2¹⁶ = 68886373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68951903) 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 in 3 ways as a sum of consecutive naturals, for example, 2651984 + ... + 2652009.

It is an arithmetic number, because the mean of its divisors is an integer number (18563979).

Almost surely, 2^68951909 is an apocalyptic number.

It is an amenable number.

68951909 is a deficient number, since it is larger than the sum of its proper divisors (5304007).

68951909 is a wasteful number, since it uses less digits than its factorization.

68951909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5304006.

The product of its (nonzero) digits is 174960, while the sum is 47.

The square root of 68951909 is about 8303.7286203247. The cubic root of 68951909 is about 410.0612817382.

The spelling of 68951909 in words is "sixty-eight million, nine hundred fifty-one thousand, nine hundred nine".