39931613993 has 2 divisors, whose sum is σ = 39931613994. Its totient is φ = 39931613992.

The previous prime is 39931613971. The next prime is 39931613999.

39931613993 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35339112169 + 4592501824 = 187987^2 + 67768^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 39931613993 - 2¹⁰ = 39931612969 is a prime.

It is not a weakly prime, because it can be changed into another prime (39931613999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19965806996 + 19965806997.

It is an arithmetic number, because the mean of its divisors is an integer number (19965806997).

Almost surely, 2^39931613993 is an apocalyptic number.

It is an amenable number.

39931613993 is a deficient number, since it is larger than the sum of its proper divisors (1).

39931613993 is an equidigital number, since it uses as much as digits as its factorization.

39931613993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3188646, while the sum is 56.

The spelling of 39931613993 in words is "thirty-nine billion, nine hundred thirty-one million, six hundred thirteen thousand, nine hundred ninety-three".