68461909 has 2 divisors, whose sum is σ = 68461910. Its totient is φ = 68461908.

The previous prime is 68461867. The next prime is 68461931. The reversal of 68461909 is 90916486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68013009 + 448900 = 8247^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 68461909 - 2¹⁹ = 67937621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68461949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34230954 + 34230955.

It is an arithmetic number, because the mean of its divisors is an integer number (34230955).

Almost surely, 2^68461909 is an apocalyptic number.

It is an amenable number.

68461909 is a deficient number, since it is larger than the sum of its proper divisors (1).

68461909 is an equidigital number, since it uses as much as digits as its factorization.

68461909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 68461909 is about 8274.1711971653. The cubic root of 68461909 is about 409.0876181987.

The spelling of 68461909 in words is "sixty-eight million, four hundred sixty-one thousand, nine hundred nine".