19740631349 has 4 divisors (see below), whose sum is σ = 20274161964. Its totient is φ = 19207100736.

The previous prime is 19740631321. The next prime is 19740631411. The reversal of 19740631349 is 94313604791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94313604791 = 7 ⋅13473372113.

It can be written as a sum of positive squares in 2 ways, for example, as 15454965124 + 4285666225 = 124318^2 + 65465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19740631349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19740631249) 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, 266765252 + ... + 266765325.

It is an arithmetic number, because the mean of its divisors is an integer number (5068540491).

Almost surely, 2^19740631349 is an apocalyptic number.

It is an amenable number.

19740631349 is a deficient number, since it is larger than the sum of its proper divisors (533530615).

19740631349 is an equidigital number, since it uses as much as digits as its factorization.

19740631349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533530614.

The product of its (nonzero) digits is 489888, while the sum is 47.

The spelling of 19740631349 in words is "nineteen billion, seven hundred forty million, six hundred thirty-one thousand, three hundred forty-nine".