3971087181 has 16 divisors (see below), whose sum is σ = 5929420800. Its totient is φ = 2626543584.

The previous prime is 3971087179. The next prime is 3971087201. The reversal of 3971087181 is 1817801793.

It is a happy number.

3971087181 is a `hidden beast` number, since 397 + 1 + 0 + 87 + 181 = 666.

It is not a de Polignac number, because 3971087181 - 2¹ = 3971087179 is a prime.

It is a super-2 number, since 2×3971087181² = 31539066798205053522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3971087101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 575616 + ... + 582473.

It is an arithmetic number, because the mean of its divisors is an integer number (370588800).

Almost surely, 2^3971087181 is an apocalyptic number.

It is an amenable number.

3971087181 is a deficient number, since it is larger than the sum of its proper divisors (1958333619).

3971087181 is a wasteful number, since it uses less digits than its factorization.

3971087181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158225 (or 1158219 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 45.

The square root of 3971087181 is about 63016.5627513910. The cubic root of 3971087181 is about 1583.5671129697.

The spelling of 3971087181 in words is "three billion, nine hundred seventy-one million, eighty-seven thousand, one hundred eighty-one".