19108398949 has 2 divisors, whose sum is σ = 19108398950. Its totient is φ = 19108398948.

The previous prime is 19108398943. The next prime is 19108398983. The reversal of 19108398949 is 94989380191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9679017924 + 9429381025 = 98382^2 + 97105^2 .

It is a cyclic number.

It is not a de Polignac number, because 19108398949 - 2⁷ = 19108398821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19108398943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9554199474 + 9554199475.

It is an arithmetic number, because the mean of its divisors is an integer number (9554199475).

Almost surely, 2^19108398949 is an apocalyptic number.

It is an amenable number.

19108398949 is a deficient number, since it is larger than the sum of its proper divisors (1).

19108398949 is an equidigital number, since it uses as much as digits as its factorization.

19108398949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5038848, while the sum is 61.

The spelling of 19108398949 in words is "nineteen billion, one hundred eight million, three hundred ninety-eight thousand, nine hundred forty-nine".