3897216811 has 4 divisors (see below), whose sum is σ = 3897351400. Its totient is φ = 3897082224.

The previous prime is 3897216803. The next prime is 3897216859. The reversal of 3897216811 is 1186127983.

It is a happy 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: 1186127983 = 31 ⋅38262193.

It is a cyclic number.

It is not a de Polignac number, because 3897216811 - 2³ = 3897216803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3897211811) 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 3 ways as a sum of consecutive naturals, for example, 4041 + ... + 88378.

It is an arithmetic number, because the mean of its divisors is an integer number (974337850).

Almost surely, 2^3897216811 is an apocalyptic number.

3897216811 is a deficient number, since it is larger than the sum of its proper divisors (134589).

3897216811 is an equidigital number, since it uses as much as digits as its factorization.

3897216811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134588.

The product of its digits is 145152, while the sum is 46.

The square root of 3897216811 is about 62427.6926611900. The cubic root of 3897216811 is about 1573.6863908562.

The spelling of 3897216811 in words is "three billion, eight hundred ninety-seven million, two hundred sixteen thousand, eight hundred eleven".