3921641897 has 2 divisors, whose sum is σ = 3921641898. Its totient is φ = 3921641896.

The previous prime is 3921641863. The next prime is 3921641921. The reversal of 3921641897 is 7981461293.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3906750016 + 14891881 = 62504^2 + 3859^2 .

It is a cyclic number.

It is not a de Polignac number, because 3921641897 - 2⁸ = 3921641641 is a prime.

It is not a weakly prime, because it can be changed into another prime (3921640897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1960820948 + 1960820949.

It is an arithmetic number, because the mean of its divisors is an integer number (1960820949).

Almost surely, 2^3921641897 is an apocalyptic number.

It is an amenable number.

3921641897 is a deficient number, since it is larger than the sum of its proper divisors (1).

3921641897 is an equidigital number, since it uses as much as digits as its factorization.

3921641897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 50.

The square root of 3921641897 is about 62623.0141162177. The cubic root of 3921641897 is about 1576.9671427280.

The spelling of 3921641897 in words is "three billion, nine hundred twenty-one million, six hundred forty-one thousand, eight hundred ninety-seven".