1068409621 has 2 divisors, whose sum is σ = 1068409622. Its totient is φ = 1068409620.

The previous prime is 1068409609. The next prime is 1068409673. The reversal of 1068409621 is 1269048601.

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., 586124100 + 482285521 = 24210^2 + 21961^2 .

It is an emirp because it is prime and its reverse (1269048601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1068409621 - 2¹³ = 1068401429 is a prime.

It is a super-2 number, since 2×1068409621² = 2282998236490727282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1068407621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 534204810 + 534204811.

It is an arithmetic number, because the mean of its divisors is an integer number (534204811).

Almost surely, 2^1068409621 is an apocalyptic number.

It is an amenable number.

1068409621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1068409621 is an equidigital number, since it uses as much as digits as its factorization.

1068409621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 1068409621 is about 32686.5357754535. The cubic root of 1068409621 is about 1022.3021246568.

The spelling of 1068409621 in words is "one billion, sixty-eight million, four hundred nine thousand, six hundred twenty-one".