1368146809 has 2 divisors, whose sum is σ = 1368146810. Its totient is φ = 1368146808.

The previous prime is 1368146807. The next prime is 1368146821. The reversal of 1368146809 is 9086418631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 839376784 + 528770025 = 28972^2 + 22995^2 .

It is a cyclic number.

It is not a de Polignac number, because 1368146809 - 2¹ = 1368146807 is a prime.

Together with 1368146807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1368146807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 684073404 + 684073405.

It is an arithmetic number, because the mean of its divisors is an integer number (684073405).

Almost surely, 2^1368146809 is an apocalyptic number.

It is an amenable number.

1368146809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1368146809 is an equidigital number, since it uses as much as digits as its factorization.

1368146809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 1368146809 is about 36988.4685949554. The cubic root of 1368146809 is about 1110.1395298452.

The spelling of 1368146809 in words is "one billion, three hundred sixty-eight million, one hundred forty-six thousand, eight hundred nine".