19431287093 has 2 divisors, whose sum is σ = 19431287094. Its totient is φ = 19431287092.

The previous prime is 19431287063. The next prime is 19431287111. The reversal of 19431287093 is 39078213491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16180348804 + 3250938289 = 127202^2 + 57017^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19431287093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19431287053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9715643546 + 9715643547.

It is an arithmetic number, because the mean of its divisors is an integer number (9715643547).

Almost surely, 2^19431287093 is an apocalyptic number.

It is an amenable number.

19431287093 is a deficient number, since it is larger than the sum of its proper divisors (1).

19431287093 is an equidigital number, since it uses as much as digits as its factorization.

19431287093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 47.

The spelling of 19431287093 in words is "nineteen billion, four hundred thirty-one million, two hundred eighty-seven thousand, ninety-three".