19950809311 has 2 divisors, whose sum is σ = 19950809312. Its totient is φ = 19950809310.

The previous prime is 19950809269. The next prime is 19950809327. The reversal of 19950809311 is 11390805991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19950809311 - 2¹¹ = 19950807263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19950809611) 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, 9975404655 + 9975404656.

It is an arithmetic number, because the mean of its divisors is an integer number (9975404656).

Almost surely, 2^19950809311 is an apocalyptic number.

19950809311 is a deficient number, since it is larger than the sum of its proper divisors (1).

19950809311 is an equidigital number, since it uses as much as digits as its factorization.

19950809311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 46.

The spelling of 19950809311 in words is "nineteen billion, nine hundred fifty million, eight hundred nine thousand, three hundred eleven".