1368275621 has 2 divisors, whose sum is σ = 1368275622. Its totient is φ = 1368275620.

The previous prime is 1368275611. The next prime is 1368275653. The reversal of 1368275621 is 1265728631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1356448900 + 11826721 = 36830^2 + 3439^2 .

It is a cyclic number.

It is not a de Polignac number, because 1368275621 - 2³⁰ = 294533797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1368275611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 684137810 + 684137811.

It is an arithmetic number, because the mean of its divisors is an integer number (684137811).

Almost surely, 2^1368275621 is an apocalyptic number.

It is an amenable number.

1368275621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1368275621 is an equidigital number, since it uses as much as digits as its factorization.

1368275621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 41.

The square root of 1368275621 is about 36990.2097993510. The cubic root of 1368275621 is about 1110.1743688953.

The spelling of 1368275621 in words is "one billion, three hundred sixty-eight million, two hundred seventy-five thousand, six hundred twenty-one".