3941394521 has 2 divisors, whose sum is σ = 3941394522. Its totient is φ = 3941394520.

The previous prime is 3941394503. The next prime is 3941394557. The reversal of 3941394521 is 1254931493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3171942400 + 769452121 = 56320^2 + 27739^2 .

It is a cyclic number.

It is not a de Polignac number, because 3941394521 - 2²² = 3937200217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (3941390521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1970697260 + 1970697261.

It is an arithmetic number, because the mean of its divisors is an integer number (1970697261).

Almost surely, 2^3941394521 is an apocalyptic number.

It is an amenable number.

3941394521 is a deficient number, since it is larger than the sum of its proper divisors (1).

3941394521 is an equidigital number, since it uses as much as digits as its factorization.

3941394521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 41.

The square root of 3941394521 is about 62780.5266065840. The cubic root of 3941394521 is about 1579.6103457489.

The spelling of 3941394521 in words is "three billion, nine hundred forty-one million, three hundred ninety-four thousand, five hundred twenty-one".