19871124149 has 2 divisors, whose sum is σ = 19871124150. Its totient is φ = 19871124148.

The previous prime is 19871124079. The next prime is 19871124157. The reversal of 19871124149 is 94142117891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15767824900 + 4103299249 = 125570^2 + 64057^2 .

It is a cyclic number.

It is not a de Polignac number, because 19871124149 - 2⁸ = 19871123893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19871124349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9935562074 + 9935562075.

It is an arithmetic number, because the mean of its divisors is an integer number (9935562075).

Almost surely, 2^19871124149 is an apocalyptic number.

It is an amenable number.

19871124149 is a deficient number, since it is larger than the sum of its proper divisors (1).

19871124149 is an equidigital number, since it uses as much as digits as its factorization.

19871124149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 47.

The spelling of 19871124149 in words is "nineteen billion, eight hundred seventy-one million, one hundred twenty-four thousand, one hundred forty-nine".