3897406181 has 2 divisors, whose sum is σ = 3897406182. Its totient is φ = 3897406180.

The previous prime is 3897406159. The next prime is 3897406243. The reversal of 3897406181 is 1816047983.

3897406181 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., 3229648900 + 667757281 = 56830^2 + 25841^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3897406181 is a prime.

It is a super-2 number, since 2×3897406181² = 30379549879394009522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3897406081) 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 as a sum of consecutive naturals, namely, 1948703090 + 1948703091.

It is an arithmetic number, because the mean of its divisors is an integer number (1948703091).

Almost surely, 2^3897406181 is an apocalyptic number.

It is an amenable number.

3897406181 is a deficient number, since it is larger than the sum of its proper divisors (1).

3897406181 is an equidigital number, since it uses as much as digits as its factorization.

3897406181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 3897406181 is about 62429.2093574795. The cubic root of 3897406181 is about 1573.7118794874.

The spelling of 3897406181 in words is "three billion, eight hundred ninety-seven million, four hundred six thousand, one hundred eighty-one".