39538089971 has 2 divisors, whose sum is σ = 39538089972. Its totient is φ = 39538089970.

The previous prime is 39538089859. The next prime is 39538089991. The reversal of 39538089971 is 17998083593.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39538089971 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (39538089991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19769044985 + 19769044986.

It is an arithmetic number, because the mean of its divisors is an integer number (19769044986).

Almost surely, 2^39538089971 is an apocalyptic number.

39538089971 is a deficient number, since it is larger than the sum of its proper divisors (1).

39538089971 is an equidigital number, since it uses as much as digits as its factorization.

39538089971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14696640, while the sum is 62.

The spelling of 39538089971 in words is "thirty-nine billion, five hundred thirty-eight million, eighty-nine thousand, nine hundred seventy-one".