18973391029 has 2 divisors, whose sum is σ = 18973391030. Its totient is φ = 18973391028.

The previous prime is 18973391011. The next prime is 18973391077. The reversal of 18973391029 is 92019337981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16230250404 + 2743140625 = 127398^2 + 52375^2 .

It is a cyclic number.

It is not a de Polignac number, because 18973391029 - 2⁹ = 18973390517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18973391329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9486695514 + 9486695515.

It is an arithmetic number, because the mean of its divisors is an integer number (9486695515).

Almost surely, 2^18973391029 is an apocalyptic number.

It is an amenable number.

18973391029 is a deficient number, since it is larger than the sum of its proper divisors (1).

18973391029 is an equidigital number, since it uses as much as digits as its factorization.

18973391029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 734832, while the sum is 52.

The spelling of 18973391029 in words is "eighteen billion, nine hundred seventy-three million, three hundred ninety-one thousand, twenty-nine".