39981194129 has 2 divisors, whose sum is σ = 39981194130. Its totient is φ = 39981194128.

The previous prime is 39981194119. The next prime is 39981194153. The reversal of 39981194129 is 92149118993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31381413904 + 8599780225 = 177148^2 + 92735^2 .

It is an emirp because it is prime and its reverse (92149118993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39981194129 - 2²⁴ = 39964416913 is a prime.

It is not a weakly prime, because it can be changed into another prime (39981194119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19990597064 + 19990597065.

It is an arithmetic number, because the mean of its divisors is an integer number (19990597065).

Almost surely, 2^39981194129 is an apocalyptic number.

It is an amenable number.

39981194129 is a deficient number, since it is larger than the sum of its proper divisors (1).

39981194129 is an equidigital number, since it uses as much as digits as its factorization.

39981194129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1259712, while the sum is 56.

The spelling of 39981194129 in words is "thirty-nine billion, nine hundred eighty-one million, one hundred ninety-four thousand, one hundred twenty-nine".