39991426193 has 2 divisors, whose sum is σ = 39991426194. Its totient is φ = 39991426192.

The previous prime is 39991426171. The next prime is 39991426201. The reversal of 39991426193 is 39162419993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36302443024 + 3688983169 = 190532^2 + 60737^2 .

It is a cyclic number.

It is not a de Polignac number, because 39991426193 - 2¹⁶ = 39991360657 is a prime.

It is not a weakly prime, because it can be changed into another prime (39991426393) 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, 19995713096 + 19995713097.

It is an arithmetic number, because the mean of its divisors is an integer number (19995713097).

Almost surely, 2^39991426193 is an apocalyptic number.

It is an amenable number.

39991426193 is a deficient number, since it is larger than the sum of its proper divisors (1).

39991426193 is an equidigital number, since it uses as much as digits as its factorization.

39991426193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2834352, while the sum is 56.

The spelling of 39991426193 in words is "thirty-nine billion, nine hundred ninety-one million, four hundred twenty-six thousand, one hundred ninety-three".