3971111 has 4 divisors (see below), whose sum is σ = 4143792. Its totient is φ = 3798432.

The previous prime is 3971087. The next prime is 3971117. The reversal of 3971111 is 1111793.

3971111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3971111 - 2¹⁸ = 3708967 is a prime.

It is a super-4 number, since 4×3971111⁴ (a number of 27 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 172657 = 3971111 / (3 + 9 + 7 + 1 + 1 + 1 + 1).

It is a Duffinian number.

3971111 is a modest number, since divided by 1111 gives 397 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3971117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86306 + ... + 86351.

It is an arithmetic number, because the mean of its divisors is an integer number (1035948).

Almost surely, 2^3971111 is an apocalyptic number.

3971111 is a deficient number, since it is larger than the sum of its proper divisors (172681).

3971111 is a wasteful number, since it uses less digits than its factorization.

3971111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172680.

The product of its digits is 189, while the sum is 23.

The square root of 3971111 is about 1992.7646624727. The cubic root of 3971111 is about 158.3570279098.

The spelling of 3971111 in words is "three million, nine hundred seventy-one thousand, one hundred eleven".