19791361 has 4 divisors (see below), whose sum is σ = 20429824. Its totient is φ = 19152900.

The previous prime is 19791341. The next prime is 19791367. The reversal of 19791361 is 16319791.

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: 16319791 = 199 ⋅82009.

It is a cyclic number.

It is not a de Polignac number, because 19791361 - 2¹¹ = 19789313 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 19791361.

It is not an unprimeable number, because it can be changed into a prime (19791367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319185 + ... + 319246.

It is an arithmetic number, because the mean of its divisors is an integer number (5107456).

Almost surely, 2^19791361 is an apocalyptic number.

It is an amenable number.

19791361 is a deficient number, since it is larger than the sum of its proper divisors (638463).

19791361 is an equidigital number, since it uses as much as digits as its factorization.

19791361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638462.

The product of its digits is 10206, while the sum is 37.

The square root of 19791361 is about 4448.7482509128. The cubic root of 19791361 is about 270.4945713414.

The spelling of 19791361 in words is "nineteen million, seven hundred ninety-one thousand, three hundred sixty-one".