3921749327641 has 2 divisors, whose sum is σ = 3921749327642. Its totient is φ = 3921749327640.

The previous prime is 3921749327603. The next prime is 3921749327653. The reversal of 3921749327641 is 1467239471293.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3919212090000 + 2537237641 = 1979700^2 + 50371^2 .

It is a cyclic number.

It is not a de Polignac number, because 3921749327641 - 2²³ = 3921740939033 is a prime.

It is not a weakly prime, because it can be changed into another prime (3921749427641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1960874663820 + 1960874663821.

It is an arithmetic number, because the mean of its divisors is an integer number (1960874663821).

Almost surely, 2^{3921749327641} is an apocalyptic number.

It is an amenable number.

3921749327641 is a deficient number, since it is larger than the sum of its proper divisors (1).

3921749327641 is an equidigital number, since it uses as much as digits as its factorization.

3921749327641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13716864, while the sum is 58.

The spelling of 3921749327641 in words is "three trillion, nine hundred twenty-one billion, seven hundred forty-nine million, three hundred twenty-seven thousand, six hundred forty-one".