19991278283 has 2 divisors, whose sum is σ = 19991278284. Its totient is φ = 19991278282.

The previous prime is 19991278261. The next prime is 19991278313. The reversal of 19991278283 is 38287219991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19991278283 - 2¹⁰ = 19991277259 is a prime.

It is not a weakly prime, because it can be changed into another prime (19991278213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9995639141 + 9995639142.

It is an arithmetic number, because the mean of its divisors is an integer number (9995639142).

Almost surely, 2^19991278283 is an apocalyptic number.

19991278283 is a deficient number, since it is larger than the sum of its proper divisors (1).

19991278283 is an equidigital number, since it uses as much as digits as its factorization.

19991278283 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 59.

The spelling of 19991278283 in words is "nineteen billion, nine hundred ninety-one million, two hundred seventy-eight thousand, two hundred eighty-three".