3997870181 has 2 divisors, whose sum is σ = 3997870182. Its totient is φ = 3997870180.

The previous prime is 3997870169. The next prime is 3997870273. The reversal of 3997870181 is 1810787993.

3997870181 is digitally balanced in base 2, 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., 3666302500 + 331567681 = 60550^2 + 18209^2 .

It is a cyclic number.

It is not a de Polignac number, because 3997870181 - 2⁶ = 3997870117 is a prime.

It is a super-2 number, since 2×3997870181² = 31965931968257945522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3997870781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1998935090 + 1998935091.

It is an arithmetic number, because the mean of its divisors is an integer number (1998935091).

Almost surely, 2^3997870181 is an apocalyptic number.

It is an amenable number.

3997870181 is a deficient number, since it is larger than the sum of its proper divisors (1).

3997870181 is an equidigital number, since it uses as much as digits as its factorization.

3997870181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 53.

The square root of 3997870181 is about 63228.7132638329. The cubic root of 3997870181 is about 1587.1192622054.

The spelling of 3997870181 in words is "three billion, nine hundred ninety-seven million, eight hundred seventy thousand, one hundred eighty-one".