39951957841 has 2 divisors, whose sum is σ = 39951957842. Its totient is φ = 39951957840.

The previous prime is 39951957827. The next prime is 39951957979. The reversal of 39951957841 is 14875915993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39904057600 + 47900241 = 199760^2 + 6921^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39951957841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39951957841.

It is not a weakly prime, because it can be changed into another prime (39951957811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19975978920 + 19975978921.

It is an arithmetic number, because the mean of its divisors is an integer number (19975978921).

Almost surely, 2^39951957841 is an apocalyptic number.

It is an amenable number.

39951957841 is a deficient number, since it is larger than the sum of its proper divisors (1).

39951957841 is an equidigital number, since it uses as much as digits as its factorization.

39951957841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12247200, while the sum is 61.

The spelling of 39951957841 in words is "thirty-nine billion, nine hundred fifty-one million, nine hundred fifty-seven thousand, eight hundred forty-one".