39508289981 has 2 divisors, whose sum is σ = 39508289982. Its totient is φ = 39508289980.

The previous prime is 39508289941. The next prime is 39508290047. The reversal of 39508289981 is 18998280593.

39508289981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30413616025 + 9094673956 = 174395^2 + 95366^2 .

It is a cyclic number.

It is not a de Polignac number, because 39508289981 - 2¹⁰ = 39508288957 is a prime.

It is a super-2 number, since 2×39508289981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39508289921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19754144990 + 19754144991.

It is an arithmetic number, because the mean of its divisors is an integer number (19754144991).

Almost surely, 2^39508289981 is an apocalyptic number.

It is an amenable number.

39508289981 is a deficient number, since it is larger than the sum of its proper divisors (1).

39508289981 is an equidigital number, since it uses as much as digits as its factorization.

39508289981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11197440, while the sum is 62.

The spelling of 39508289981 in words is "thirty-nine billion, five hundred eight million, two hundred eighty-nine thousand, nine hundred eighty-one".