19979539093 has 2 divisors, whose sum is σ = 19979539094. Its totient is φ = 19979539092.

The previous prime is 19979539081. The next prime is 19979539103. The reversal of 19979539093 is 39093597991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14703260049 + 5276279044 = 121257^2 + 72638^2 .

It is a cyclic number.

It is not a de Polignac number, because 19979539093 - 2⁵ = 19979539061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19979539043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9989769546 + 9989769547.

It is an arithmetic number, because the mean of its divisors is an integer number (9989769547).

Almost surely, 2^19979539093 is an apocalyptic number.

It is an amenable number.

19979539093 is a deficient number, since it is larger than the sum of its proper divisors (1).

19979539093 is an equidigital number, since it uses as much as digits as its factorization.

19979539093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18600435, while the sum is 64.

The spelling of 19979539093 in words is "nineteen billion, nine hundred seventy-nine million, five hundred thirty-nine thousand, ninety-three".