39516949891 has 2 divisors, whose sum is σ = 39516949892. Its totient is φ = 39516949890.

The previous prime is 39516949883. The next prime is 39516949909. The reversal of 39516949891 is 19894961593.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39516949891 - 2³ = 39516949883 is a prime.

It is not a weakly prime, because it can be changed into another prime (39516949811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19758474945 + 19758474946.

It is an arithmetic number, because the mean of its divisors is an integer number (19758474946).

Almost surely, 2^39516949891 is an apocalyptic number.

39516949891 is a deficient number, since it is larger than the sum of its proper divisors (1).

39516949891 is an equidigital number, since it uses as much as digits as its factorization.

39516949891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18895680, while the sum is 64.

The spelling of 39516949891 in words is "thirty-nine billion, five hundred sixteen million, nine hundred forty-nine thousand, eight hundred ninety-one".