19909313 has 4 divisors (see below), whose sum is σ = 20394948. Its totient is φ = 19423680.

The previous prime is 19909303. The next prime is 19909361. The reversal of 19909313 is 31390991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31390991 = 4993 ⋅6287.

It can be written as a sum of positive squares in 2 ways, for example, as 399424 + 19509889 = 632^2 + 4417^2 .

It is a cyclic number.

It is not a de Polignac number, because 19909313 - 2¹⁰ = 19908289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19909303) 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, 242756 + ... + 242837.

It is an arithmetic number, because the mean of its divisors is an integer number (5098737).

Almost surely, 2^19909313 is an apocalyptic number.

It is an amenable number.

19909313 is a deficient number, since it is larger than the sum of its proper divisors (485635).

19909313 is an equidigital number, since it uses as much as digits as its factorization.

19909313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485634.

The product of its (nonzero) digits is 6561, while the sum is 35.

The square root of 19909313 is about 4461.9853204599. The cubic root of 19909313 is about 271.0308693384.

The spelling of 19909313 in words is "nineteen million, nine hundred nine thousand, three hundred thirteen".