68621513 has 2 divisors, whose sum is σ = 68621514. Its totient is φ = 68621512.

The previous prime is 68621471. The next prime is 68621563. The reversal of 68621513 is 31512686.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48622729 + 19998784 = 6973^2 + 4472^2 .

It is a cyclic number.

It is not a de Polignac number, because 68621513 - 2⁸ = 68621257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68621513.

It is not a weakly prime, because it can be changed into another prime (68621563) 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, 34310756 + 34310757.

It is an arithmetic number, because the mean of its divisors is an integer number (34310757).

Almost surely, 2^68621513 is an apocalyptic number.

It is an amenable number.

68621513 is a deficient number, since it is larger than the sum of its proper divisors (1).

68621513 is an equidigital number, since it uses as much as digits as its factorization.

68621513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 32.

The square root of 68621513 is about 8283.8102947858. The cubic root of 68621513 is about 409.4052709819.

The spelling of 68621513 in words is "sixty-eight million, six hundred twenty-one thousand, five hundred thirteen".