19294171439 has 2 divisors, whose sum is σ = 19294171440. Its totient is φ = 19294171438.

The previous prime is 19294171417. The next prime is 19294171513. The reversal of 19294171439 is 93417149291.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19294171439 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19294171139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9647085719 + 9647085720.

It is an arithmetic number, because the mean of its divisors is an integer number (9647085720).

Almost surely, 2^19294171439 is an apocalyptic number.

19294171439 is a deficient number, since it is larger than the sum of its proper divisors (1).

19294171439 is an equidigital number, since it uses as much as digits as its factorization.

19294171439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 50.

The spelling of 19294171439 in words is "nineteen billion, two hundred ninety-four million, one hundred seventy-one thousand, four hundred thirty-nine".