19867231091 has 2 divisors, whose sum is σ = 19867231092. Its totient is φ = 19867231090.

The previous prime is 19867231073. The next prime is 19867231103. The reversal of 19867231091 is 19013276891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19867231091 - 2²⁶ = 19800122227 is a prime.

It is not a weakly prime, because it can be changed into another prime (19867231031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9933615545 + 9933615546.

It is an arithmetic number, because the mean of its divisors is an integer number (9933615546).

Almost surely, 2^19867231091 is an apocalyptic number.

19867231091 is a deficient number, since it is larger than the sum of its proper divisors (1).

19867231091 is an equidigital number, since it uses as much as digits as its factorization.

19867231091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 47.

The spelling of 19867231091 in words is "nineteen billion, eight hundred sixty-seven million, two hundred thirty-one thousand, ninety-one".