39458951681 has 2 divisors, whose sum is σ = 39458951682. Its totient is φ = 39458951680.

The previous prime is 39458951627. The next prime is 39458951713. The reversal of 39458951681 is 18615985493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35403809281 + 4055142400 = 188159^2 + 63680^2 .

It is a cyclic number.

It is not a de Polignac number, because 39458951681 - 2¹⁸ = 39458689537 is a prime.

It is a super-2 number, since 2×39458951681² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 39458951681.

It is not a weakly prime, because it can be changed into another prime (39458951621) 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, 19729475840 + 19729475841.

It is an arithmetic number, because the mean of its divisors is an integer number (19729475841).

Almost surely, 2^39458951681 is an apocalyptic number.

It is an amenable number.

39458951681 is a deficient number, since it is larger than the sum of its proper divisors (1).

39458951681 is an equidigital number, since it uses as much as digits as its factorization.

39458951681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9331200, while the sum is 59.

The spelling of 39458951681 in words is "thirty-nine billion, four hundred fifty-eight million, nine hundred fifty-one thousand, six hundred eighty-one".