3991757941 has 2 divisors, whose sum is σ = 3991757942. Its totient is φ = 3991757940.

The previous prime is 3991757929. The next prime is 3991757993. The reversal of 3991757941 is 1497571993.

3991757941 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3259839025 + 731918916 = 57095^2 + 27054^2 .

It is a cyclic number.

It is not a de Polignac number, because 3991757941 - 2¹¹ = 3991755893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3991751941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1995878970 + 1995878971.

It is an arithmetic number, because the mean of its divisors is an integer number (1995878971).

Almost surely, 2^3991757941 is an apocalyptic number.

It is an amenable number.

3991757941 is a deficient number, since it is larger than the sum of its proper divisors (1).

3991757941 is an equidigital number, since it uses as much as digits as its factorization.

3991757941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2143260, while the sum is 55.

The square root of 3991757941 is about 63180.3604057463. The cubic root of 3991757941 is about 1586.3100144979.

The spelling of 3991757941 in words is "three billion, nine hundred ninety-one million, seven hundred fifty-seven thousand, nine hundred forty-one".