1368992321 has 4 divisors (see below), whose sum is σ = 1369562544. Its totient is φ = 1368422100.

The previous prime is 1368992297. The next prime is 1368992323. The reversal of 1368992321 is 1232998631.

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: 1232998631 = 21391 ⋅57641.

It is a cyclic number.

It is not a de Polignac number, because 1368992321 - 2⁶ = 1368992257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1368992323) 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, 281495 + ... + 286316.

It is an arithmetic number, because the mean of its divisors is an integer number (342390636).

Almost surely, 2^1368992321 is an apocalyptic number.

It is an amenable number.

1368992321 is a deficient number, since it is larger than the sum of its proper divisors (570223).

1368992321 is an equidigital number, since it uses as much as digits as its factorization.

1368992321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570222.

The product of its digits is 139968, while the sum is 44.

The square root of 1368992321 is about 36999.8962295842. The cubic root of 1368992321 is about 1110.3681707571.

The spelling of 1368992321 in words is "one billion, three hundred sixty-eight million, nine hundred ninety-two thousand, three hundred twenty-one".