19431346357 has 12 divisors (see below), whose sum is σ = 19964876548. Its totient is φ = 18911692800.

The previous prime is 19431346339. The next prime is 19431346373. The reversal of 19431346357 is 75364313491.

It can be written as a sum of positive squares in 6 ways, for example, as 16985648241 + 2445698116 = 130329^2 + 49454^2 .

It is a de Polignac number, because none of the positive numbers 2^k-19431346357 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 (19431346387) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 693973 + ... + 721429.

Almost surely, 2^19431346357 is an apocalyptic number.

It is an amenable number.

19431346357 is a deficient number, since it is larger than the sum of its proper divisors (533530191).

19431346357 is an equidigital number, since it uses as much as digits as its factorization.

19431346357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27960 (or 27919 counting only the distinct ones).

The product of its digits is 816480, while the sum is 46.

It can be divided in two parts, 1943134 and 6357, that added together give a palindrome (1949491).

The spelling of 19431346357 in words is "nineteen billion, four hundred thirty-one million, three hundred forty-six thousand, three hundred fifty-seven".