1368827561 has 2 divisors, whose sum is σ = 1368827562. Its totient is φ = 1368827560.

The previous prime is 1368827519. The next prime is 1368827587. The reversal of 1368827561 is 1657288631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 873498025 + 495329536 = 29555^2 + 22256^2 .

It is an emirp because it is prime and its reverse (1657288631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1368827561 - 2¹⁴ = 1368811177 is a prime.

It is not a weakly prime, because it can be changed into another prime (1368827501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 684413780 + 684413781.

It is an arithmetic number, because the mean of its divisors is an integer number (684413781).

Almost surely, 2^1368827561 is an apocalyptic number.

It is an amenable number.

1368827561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1368827561 is an equidigital number, since it uses as much as digits as its factorization.

1368827561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 47.

The square root of 1368827561 is about 36997.6696698589. The cubic root of 1368827561 is about 1110.3236242206.

The spelling of 1368827561 in words is "one billion, three hundred sixty-eight million, eight hundred twenty-seven thousand, five hundred sixty-one".