39728865091 has 2 divisors, whose sum is σ = 39728865092. Its totient is φ = 39728865090.

The previous prime is 39728865089. The next prime is 39728865221. The reversal of 39728865091 is 19056882793.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39728865091 - 2¹ = 39728865089 is a prime.

Together with 39728865089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (39728865061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19864432545 + 19864432546.

It is an arithmetic number, because the mean of its divisors is an integer number (19864432546).

Almost surely, 2^39728865091 is an apocalyptic number.

39728865091 is a deficient number, since it is larger than the sum of its proper divisors (1).

39728865091 is an equidigital number, since it uses as much as digits as its factorization.

39728865091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6531840, while the sum is 58.

The spelling of 39728865091 in words is "thirty-nine billion, seven hundred twenty-eight million, eight hundred sixty-five thousand, ninety-one".