1368767809 has 4 divisors (see below), whose sum is σ = 1440808240. Its totient is φ = 1296727380.

The previous prime is 1368767783. The next prime is 1368767819. The reversal of 1368767809 is 9087678631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9087678631 = 87121 ⋅104311.

It is a cyclic number.

It is not a de Polignac number, because 1368767809 - 2⁷ = 1368767681 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1368767809.

It is not an unprimeable number, because it can be changed into a prime (1368767819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36020187 + ... + 36020224.

It is an arithmetic number, because the mean of its divisors is an integer number (360202060).

Almost surely, 2^1368767809 is an apocalyptic number.

1368767809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1368767809 is a deficient number, since it is larger than the sum of its proper divisors (72040431).

1368767809 is an equidigital number, since it uses as much as digits as its factorization.

1368767809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72040430.

The product of its (nonzero) digits is 3048192, while the sum is 55.

The square root of 1368767809 is about 36996.8621507284. The cubic root of 1368767809 is about 1110.3074680529.

The spelling of 1368767809 in words is "one billion, three hundred sixty-eight million, seven hundred sixty-seven thousand, eight hundred nine".