68612321 has 2 divisors, whose sum is σ = 68612322. Its totient is φ = 68612320.

The previous prime is 68612309. The next prime is 68612329. The reversal of 68612321 is 12321686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58140625 + 10471696 = 7625^2 + 3236^2 .

It is a cyclic number.

It is not a de Polignac number, because 68612321 - 2¹⁰ = 68611297 is a prime.

It is not a weakly prime, because it can be changed into another prime (68612329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34306160 + 34306161.

It is an arithmetic number, because the mean of its divisors is an integer number (34306161).

Almost surely, 2^68612321 is an apocalyptic number.

It is an amenable number.

68612321 is a deficient number, since it is larger than the sum of its proper divisors (1).

68612321 is an equidigital number, since it uses as much as digits as its factorization.

68612321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 29.

The square root of 68612321 is about 8283.2554590571. The cubic root of 68612321 is about 409.3869899252.

The spelling of 68612321 in words is "sixty-eight million, six hundred twelve thousand, three hundred twenty-one".