39751985641 has 3 divisors (see below), whose sum is σ = 39752185021. Its totient is φ = 39751786262.

The previous prime is 39751985639. The next prime is 39751985699. The reversal of 39751985641 is 14658915793.

The square root of 39751985641 is 199379.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 14658915793 = 55291 ⋅265123.

It is not a de Polignac number, because 39751985641 - 2¹ = 39751985639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39751985341) 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 in 2 ways as a sum of consecutive naturals, for example, 99690 + ... + 299068.

Almost surely, 2^39751985641 is an apocalyptic number.

39751985641 is the 199379-th square number.

39751985641 is the 99690-th centered octagonal number.

It is an amenable number.

39751985641 is a deficient number, since it is larger than the sum of its proper divisors (199380).

39751985641 is an frugal number, since it uses more digits than its factorization.

39751985641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398758 (or 199379 counting only the distinct ones).

The product of its digits is 8164800, while the sum is 58.

The spelling of 39751985641 in words is "thirty-nine billion, seven hundred fifty-one million, nine hundred eighty-five thousand, six hundred forty-one".